Tamper Tantrum Talk: Bourbon

I was asked by Colin Harmon to give a talk at the Tamper Tantrum event at the UK Barista Championship. He gave me a one word topic, so I thought I’d have a little fun with it.

I hope you enjoy the talk, I’m sure there are a few factual holes that people will pick up on. (I really struggled with the pain from a back injury that day, so it isn’t quite as coherent as I’d like – but no excuses!)

If you haven’t explored the amazing library of talks that they’ve built up so far – then this is what you should do with your weekend! You can subscribe in iTunes too.


Jackson O’Brien wrote a response to the video here.

Reverse engineering espresso

Typically when we think about brewing espresso it all starts with a dose of dry coffee going into a basket. We might start out with our 19g of coffee, and think about what we want to do from there. We might try a ratio that we enjoyed with another coffee, and taste it and measure it and make adjustments from there.

I’m not making a criticism of the way we think – when you make coffee you feel like everything starts with the raw materials, and this isn’t a terrible way to think. At the end of all this you’ll end up with a recipe, but different coffees will need to be treated differently (even if you want to confine them within the same parameters).

Technology exists, however, for us to start to think about it from the end point backwards, to reverse engineer our product. Why does this matter? If we start from the end of the process, we start by clearly defining the customer experience and then using our techniques, equipment and understanding to create and craft that.

This means that we might have to make some pretty critical decisions that aren’t used to making. Let’s start with a topic that’s always a little tricky for us:

How strong should my espresso be?

This is a fun place to start, but it does mean you’ll need some experience in measuring the strength of espresso and have been paying attention enough to know what you like.

As a reference point – I rarely enjoy espressos that exceed 12% strength. At this point the shot certainly have a tonne of texture, but I find the flavours too concentrated to be easily discernible and enjoyable. I really enjoy espresso in the 9–10% range. This is simply my own preference, and by no means a recommendation. Lots of people have strong, positive responses to very strong espressos.

How much espresso do I want to serve?

This feels like a particularly strange question, but it is worth considering. How much liquid do you want to put in a cup? Is 32g of espresso worth the same as 36g of espresso? Either way, for this to work you need to make a decision.

Personally, again all preference, I don’t really want more than 50g as a double – generally I prefer a double to be 36–40g of coffee.

What about extraction?

Enough’s been said about extraction to spare too much in-depth conversation. You like what you like, either as a cafe or a roaster – and certainly as a roaster you should be targeting roasts against a specific level of extraction. I like espresso, from conventional flat burr grinders, at around 20% extraction.

So now I have a recipe. I know I want 40g of coffee, at 9% strength that is a 20% extraction. Fire up VST Coffee Tools and plug it in. By adjusting dry coffee dose until I hit my desired extraction then I can see that for this recipe to work I should start with 18.6g of coffee.

I can then start with 18.6g to 40g and adjust grind until I hit my desired espresso – presuming my water, grinder and baskets allow me to do this. I would pretty much ignore time (though from experience I know it will likely end up in the late 20s/very early 30s). I wouldn’t dial in against time though, I’d be pulling on scales to hit my shot weights.

Is this how I should make all espresso now?

The idea of this post isn’t to change the way you dial in, but instead to present an alternative way to think about how we generate our brew recipes. I think it is pretty healthy to change it up sometimes, to start with what our customer will drink (and how we want that to taste) and to work backwards from there.

How to progress in the coffee industry

I get a lot of email (a lot of emails) from baristas from all around the world, and the most common theme could be summarised as:

“I currently work as a barista, I’m really passionate about coffee and would love to progress in this industry. Do you have any advice for how I should do that?”

It’s a fair question – coffee is a relatively opaque, shrouded industry that doesn’t really give much away in the way of direction for those who have fallen in love with it and wish to do more.

This is similar to the talk I gave at the Nordic Barista Cup, but that crossed over quite a lot into talking to employers and those already established within the industry.

This post is by no means a definitive answer, but hopefully it offers some helpful advice.

Demonstrate Patience

There’s a whole other topic that should probably be covered about writing effective CVs (résumés) and performing in job interviews, but this particular one straddles both. The expectations of those entering industries have changed. People expect to be able to progress quicker, and often the most visible within an industry rose very quickly (or at least appeared to). Other industries generally do a better job of explaining why you should spend a couple of years toiling away for little reward, or at least set clear goals for what must be achieved to progress. Coffee is one of many where this isn’t really a thing yet.

However, employers look at your work history for two reasons: to see what kind of experience you have and to see how long you generally stay in a job.

Collecting a few months at various well renown cafes is significantly less valuable that having put some serious time in at a cafe someone may never have heard of. Yes, a cafe owner may look at that and see a reduced need for training, but if you’re looking to progress into a different role which will require time spent acquiring new skills then skipping around from place to place is potentially going to work against you.

This doesn’t mean you should be you shouldn’t be hungry to progress, keen to advance – that’s definitely a good quality.

Taste Everything

While we generally under-represent the diverse roles within the coffee sector, there are very few roles where being able to taste well isn’t an advantage. Learning to taste well, to taste critically and to build up a level of objectivity around certain aspects of coffee tasting, isn’t easy to do.

If you work at a cafe this means tasting more than the coffees you serve. It means tasting coffees from other suppliers, tasting coffees from other cafes. It means looking for any and every opportunity to taste with other coffee professionals, in an environment where honest discussion takes place. It means looking for opportunities to taste things that aren’t coffee in different environments. Beer, wine, cheese are the obvious contenders as there are often tutored tasting available and things like sweetness, acidity, complexity, aroma or mouthfeel are all key aspects in their taste make up as they are with coffee. If there are opportunities to taste other things then leap at it.

If there aren’t those opportunities where you are then make them. £20 goes a long way to buying a variety of things to taste within a theme – from chocolate to citrus fruits, olive oils to tomatoes. (Thanks to my team at Square Mile for the inspiration here).

Be Part of a Community

If I am honest, online communities are significantly less helpful for curious and passionate coffee people than they were five years ago. Social media has undeniably had an impact, but its return on invested energy is mild frivolity and a worrying acceptance of crass absolutism. I’d recommend looking for a real life, in the flesh type community to be involved in.

In some places this is easier than in others, I accept that. If your city has throwdowns, or open tastings, or coffee book clubs, or general coffee events then get involved. That doesn’t mean just turning up, it means putting in some time and effort. Passive participation can be enjoyable, but isn’t really going to help you move forward.

Networking is a horrible term, but it remains a practice that goes on in every industry. It doesn’t have to be the awkward “press the flesh” type thing though. Guilds, associations and the like are there to offer this function as a core reason for their very being. I’d recommend getting involved with them.

Don’t expect to be spoonfed knowledge

It is an employer’s role to provide necessary information to do a job well, unless they’ve hired requiring a certain qualification. However, it is not really an employer’s obligation to feed every curiosity you may have about coffee. This sounds negative, but in reality it is easier to learn collaboratively with an employee (supporting them in their learning, rather than doing all the heavy lifting) than it is to just have information be a one way street. Not every employer will work this way, and I suppose I should recommend finding employers who have a good track record with developing staff and supporting them in future endeavours is another piece of advice.

This isn’t exhaustive, not even slightly, but I hope it is useful. Obviously I’d recommend keeping an eye on job openings (never easier these days with sites like Coffee Jobs Board, NYC Coffee Jobs and Sprudge Jobs).

Disagreement, dissent or supplementation to these ideas is welcome.


Peter Giuliano has written a great response to this, which I strongly recommend you read.

Introducing Coffee Jobs Board

About 5 years ago I set up a website for coffee jobs in London. Today I’m launching both a redesign of that, as well as a global jobs board hub. If you want to skip the explanations and ideas behind then feel free to explore the site here:



I originally created a site because I’d get a lot of emails from baristas looking for work, and lots of emails from shops looking for staff. I felt like my inbox probably wasn’t the best place to connect people. So I built a simple site, and left it be. It covered its costs, and slowly grew.

People seemed very happy with it, the biggest complaint being people outside of London who wanted something similar. A while ago I decided to start saving up to do something bigger and this is the result.

How the site works

I wanted to build a site full of little hubs, so people could see jobs relevant to them and not worry about what was happening elsewhere (the way craigslist works was a source of inspiration). For each country or city there is a board that you can bookmark, a twitter account you can follow and an email sign up for alerts. I didn’t want to build lots of individual sites, but if there is just one then there’s the problem of when you’re looking for a job in Paris, but a job in Portland isn’t really of interest. You can apply for jobs through the site, and look at employer’s profiles to find out more about them.

I’ve tried to make sure as much of the site as possible has been translated into other languages, though there are some technical constraints I don’t have the budget to overcome –  I hope to improve it in the future.

Advertising jobs

There are three different jobs categories available: city-wide, country-wide and worldwide. For the rest of the month city and country jobs will be free to post. (I don’t want to make worldwide free in case people abuse it and boards get littered with jobs from other countries). In the future the pricing will be:

City – £10. This will appear in that city board, and also the country board. (i.e. London and the UK)

Country – £15. This will appear in the country board, and every city board in that country too.

Worldwide – £100. This will appear in every single job board. It is priced high to discourage use, because I think very few companies need to advertise worldwide.

I wanted to keep it pretty accessibly priced to post – the people part of coffee is hard enough.

London Coffee Jobs

Hopefully most of the existing site has migrated across – including logins etc, so if you’ve posted there in the past you should have an existing account on the new site. If you don’t then I’d recommend signing up again, as it would be great if employers could add a little more detail to their profiles. If there are issues then drop a line to the support email.

Unfortunately if you posted a job in the last couple of days it won’t be allocated to your login, and any changes will have to be done manually by me – just drop a line to support.

Where’s my city/country?!

It wasn’t possible to launch with every part of the world covered, but I am open to requests. If there is sufficient demand then I can create a new board for people to use. Please bear with me if translation is required. You can request a board by emailing request@coffeejobsboard.com

Help me spread the word?

It would be great if people shared the site with friends who may be looking for work, or with business who may be looking for staff. I hope it becomes a useful and valuable hub for people in coffee. Again – it is free to use to post jobs on for the rest of the month.

And if you’ve made it all the way here and haven’t had a look yet – please check it out!


The price of espresso in London 2014

A little less than a year ago I wrote a short piece about the price of coffee in London. For that post I’d used the London Coffee Guide produced by a company called Allegra, (who do a lot of research) which launches at the London Coffee Festival which starts tomorrow.

Very kindly, and out of the blue, they forwarded me the data from this year’s book, and in a spreadsheet no less! (Meaning I didn’t have to put the prices in manually this time.) I thought I’d write about where things are now, what has changed and what hasn’t.

Espresso pricing

2013 Vs 2014
Year 2013 2014
Lowest Price £1.30 £1.50
Highest Price £2.60 £2.60
Average Price £1.89 £1.99
Mode Price £2.00 £2.00

A few small changes: those charging the lowest price for espresso have either increased pricing, or those businesses at the bottom end of pricing are no longer in business. At the top end there has been little to no change. However, the change in pricing distribution has moved the average and the mode to be essentially the same. Overall the price of espresso in London has increased, by around 5.3% which is above the rate of inflation (2.4-3.0%).

Pricing distribution looks very similar to last year except that the number of cafes charging £2.00 (the mode) has increased from 35% to 42% of the cafes listed in the guide. I should note at this point that prices for a double espresso were used when two prices were listed.

Price distribution by neighbourhood


One rather lovely addition to the data shared is that each cafe had been tagged with its neighbourhood in London. This allowed me to look at the distribution of price across London. Here it is with the average price for an espresso and a flat white, and where they rank from most expensive (1) to cheapest (11):

2013 Vs 2014
Region Espresso (£) Rank (11) Flat White (£) Rank (11)
East London £1.89 10 £2.51 9
Farringdon/Clerkenwell £2.07 4 £2.56 6
Holborn/Bloomsbury £2.09 3 £2.66 3
Inner East/Shoreditch £1.96 7 £2.63 4
North London £1.94 9 £2.50 10
Soho £2.11 2 £2.63 5
South East £1.79 11 £2.33 11
South West £2.02 6 £2.56 7
The City £1.96 8 £2.76 1
West End £2.17 1 £2.73 2
West London £2.03 5 £2.55 8

While this is interesting, it is hardly revelatory – but there are a few notables. The most expensive retail rent in London (the West End) comes with the most expensive coffee – I don’t think anyone is particularly surprised by this.  The South East is also considered a relatively cheap (in comparison to the rest of London) place to do business, but it is interesting to see how much cheaper coffee is down there.

I was surprised to see espresso in the City was cheaper than the average (even if it is just a little under). Amusingly milk drinks are the most expensive in London, so either bankers are buying bigger cups of coffee (I used the highest price for a flat white listed for each cafe) or the cafes are recouping their expensive rent costs with their most popular drinks. On principle they should probably be more expensive…

I’m not exactly sure why, but I was quite surprised to find the standard deviation across the prices to be so similar – 11p for espresso and 12p for flat whites. To me I would say that this indicates that cafes pay attention to each other’s pricing a lot (probably more than customers) – but I’m aware that I’m stating the obvious again…

I didn’t do the data analysis on milk drinks in 2013, so hopefully I can keep it up from this year onwards. This post is just a presentation of data, and has nothing to do with what I think cafes should be charging for espresso drinks – simply what they are charging right now.

Hipsters, coffee and authenticity

I don’t really like the word hipster, nor do I condone its usage (despite occasional indulgence), but I did spend some time recently trying to work out what it meant and what we mean when we use it.

It isn’t really a cultural label the way “goth” or “mod” were and are. I think the word has ended up being many things to many people, but I think when you use it there is, at its root, one key idea: you are saying “I don’t believe you.”

It is the label given to those who posture, whose cultural, sartorial or intellectual pretence is painful to see. This is why no one self identifies this way – we are believe we’re telling the truth, or at least getting away with looking like we do.

Hipster gets thrown at coffee a great deal too. Half the time to describe the people behind the counter, half the time to describe those patiently queuing to buy it. The aloof barista, with a carefully cultivated sense of ennui and the vaguely disguised disgust at the coarseness and ignorance of customers, is perhaps the arch trope of coffee today.

When we see such theatricality, perhaps we assume that every aspect is a performance. Caring about coffee, being interested in it and deeply involved in it, all of this must be part of the act. How can we, as a customer, tell which part is genuine and which some sort of pretence.

I read a piece on coffee consumption that brought me back to this Frank Bruni piece from a few years ago in the New York Times. This particular sentence was highlighted (emphasis mine):

“In these food-mad times, have the economically privileged among us gone too far in turning simple acts of nourishment into complicated rituals of self-congratulation?

Have we offered up coffee as a way to define who we are as customers? Is this something modern or is this simply the next step after coffee’s position as the epitome of the Fair Trade movement, the next step in the evolution of our relationship with a product thats complexity is slowly starting to seep into the public sphere.

While I don’t really see coffee in London, or the UK, being regularly used by consumer’s to really define themselves (outside of those for whom coffee is a passion) – I do see a great deal of inauthenticity within the industry.

Part of this, I think, is a byproduct of the homogeneity that can develop in a market or a result of tapping into the hive mind of the coffee industry online. London is home to what others have described as the “chain with no name”, independent cafes that look and feel very similar to each, offer very similar products at similar prices, with similar service experiences, but have no shared ownership. In a situation like this, it seems pretty obvious to anyone that each of these business is unlikely to be the honest expression of an individual, and can end up looking like bandwagon-jumping or an attempt to profiteer from a trend someone doesn’t truly understand. I understand that conformity offers safety, and I see that the industry doesn’t often encourage the kind of risk taking we want to see. This part, however, may in part be because we’ve struggled to work out how the risk/reward model could really offer something compelling.

Authenticity comes from honesty, from transparency. Cafes are great canvases, for the expression of ideas about service, about taste, about design, about community, and about coffee itself. All too rarely are they any, let alone all, of these things. When they are clearly the result of someone’s considered, and personal, vision I think they’re compelling, and I believe consumers can tell and respond strongly to it. My limited experience within my own market supports this.

The cafes around London, past and present, that I have formed the strongest bonds with all have a genuine identity, from their owners and founders, that I find strongly appealing. I deeply hope to see more of this in the future, because I believe it will make talking to people about why coffee is worth their attention, their money and their time so much easier.

Learning Project: An update and the next topic

Today I closed submissions to the January topic and I’ve updated the blog post to show a full list of further reading links you lovely people submitted. Some people’s submitted links didn’t work, and I haven’t had the time to work out what they meant to submit.

The voters have also chosen the next topic. In the next couple of weeks I will write and post:

An introduction to coffee roasting

This is going to be tricky, and I know that when I call for links to further reading that there isn’t a lot of stuff online. However, there is more than you think…

I just want to make clear that what I will write will be designed as an introduction. It won’t be too superficial (I hope) but I will be leaving out some of the fuzzy stuff that is full of half baked opinions, pseudo science and conjecture. It’s actually quite an intimidating topic to write an introduction for…

There’s some great reading to be had back in the acidity post – so I hope people enjoy getting stuck in!

An admission of failure

Maybe I set the bar too high in my own mind, maybe I wasn’t sufficiently clear and maybe (the most likely explanation) it just wasn’t that good of an idea to start with.

UPDATE: Twitter has informed me that the problem is my expectations, and that I should stop being churlish for what many would consider a good result. I have since reviewed my expectations for this – there’ll definitely be a part two… My expectations are likely skewed by the last two times I requested reader participation which each generated 500+ responses.

The idea behind the collaborative learning project was that if you gave a little you got something more in return. The first post on acidity has had 10k+ views, excluding the several thousand who subscribe to the RSS feed. I had hoped that even 1 in 100 page views might yield a submitted link, but for all the views and the thousand of people who read the post I’ve received (to date) 29 viable links on the subject of acidity. (Less than 1 per 400 views)

Let me be clear: I’m not really blaming anyone else but me for this, and I’m not really moaning about it either. This isn’t an “oh poor me!” blog post, I promise you. My predictions of how this would go were based more on my own hopes, rather than evidence or historical precedents.

I’m not yet sure if I am going to continue with the project, or certainly continue it in its current form. I will definitely update the existing blog post with the links submitted on acidity so far, but as for starting a new topic – I don’t think so. Failure is fine, it should be accepted, and sometimes it is ok to let things go and to move on to other projects. There are a few other ideas in the pipeline, so hopefully they’ll come to fruition soon!

An Introduction to Acidity

This is the first topic in the learning project series of posts. Please click through at the end to share a link for further reading on the topic.

Acidity is an important part of coffee, and weaves its way through the entire supply chain of the industry from variety to picking, from process to roasting and from brewing to tasting. I want to start with the basics, cover some of the tasting aspect and then look at acids specific to coffee.

We tend to define acids as having a pH lower than 7, or as having a sour taste, but these aren’t particularly scientific. In fact there are three different scientific definitions of an acid: The Arrhenius definition, the Brønsted-Lowry definition and the Lewis definition. I think the Arrhenius definition is going to serve us best here which is:

An Arrhenius acid is a substance that dissociates in water to form hydrogen ions (H+) that is, an acid increases the concentration of H+ ions in an aqueous solution.

The important part to note here is the presence of H+ ions, as we’ll discuss this later. It should be noted that his definition specifies an aqueous solution, so you could argue that pure hydrochloric acid, or pure sulphuric acid wouldn’t count as acid but this would be nitpicking.

The measurement of the level of acidity is done through measuring the number of these H+ ions,  and is usually communicated through the pH scale. While there is some disagreement on exactly what pH stands for but the Carlsberg Foundation (tied to the Carlsberg Labratory where Søren Peder Lauritz Sørensen did the work to first introduce the scale) claims it stands for “power of hydrogen”.

It is important to remember that the pH scale is logarithmic. This means that each whole value below 7 is ten times  more acidic. Thus a pH of 4 is 10 times more acidic than a pH of 5, and 100 times more acidic than a pH of 6.

Tasting Acidity

Acidity is often described as being one of the 5 tastes, which is deeply unfair to other tastes such as pungency, astringency, piquancy or metallic tastes. (Much like saying we only have five senses ignores senses like balance or the sensation radiant heat). It is a critical part of the foods we taste, though it doesn’t have the same functionality as sweetness (the suggestion that something is good to eat) or bitterness (the warning that a food may be poisonous).

We have a very good idea of how taste receptors, in our mouths, detect sourness. That doesn’t mean it is particularly simple though. What happens is that a hydrogen ion (H+) enters the cell and essentially triggers an electrical response that fires the nerve that sends the signal to the brain that we are tasting something acidic.

Types of Acid in Food

There are a variety of different acids in food that influence our perception and enjoyment of it. Adding acids to foods (either more traditionally by using an acidic liquid like a juice, or in the more modern way of using them in powdered forms as food additives) is likely as old as cooking and the ideas of recipes. They also play a crucial role in preservation as well as providing some anti-oxidative properties.

Here are some of the key acids in food:

Acetic acid – We are most familiar with this acid as vinegar (though only acetic acid produced through fermentation can be called vinegar). This is an acid that can be extremely unpleasant (it is awful when present in coffee through defective processing), but we do like to add it to fried potatoes a lot.

Citric acid – This is the acid found in citrus fruit, and if you give most people plain water with citric acid added to it they will describe as tasting of lemons. This is an incredibly popular food additive – it is the acid used in sour sweets/candy – and it is no longer efficient to extract it from citrus fruit. Instead it is now often produced by fermenting a carbohydrate (like molasses) using a mould called Aspergillus niger.

Fumaric acid – This one doesn’t really occur in common foodstuffs (unless you enjoy eating lichen and Iceland moss), but it is used extensively as a food additive and acidity regulator. It is often used in soft drinks and can also be added as a coagulent in things like stovetop pudding mixes.

Lactic acid – Most of us are as familiar with the pain of lactic acid build up in muscles, as we are with the taste of it in sour milk products like yoghurt or cottage cheese, or with the sourness it brings to sourdough bread. Outside of food it also is used in things  like detergents and as an active ingredient in mosquito lures.

Malic acid – This is the acid found in fruit like apples and pears, though for a more explicit experience of malic acid then the delicious tartness of rhubard is an excellent example. It was first isolated from apples, and as such takes its name from the latin malum. Despite being a little more expensive than citric acid, it is used in many similar products such as sodas (particularly diet ones) and also in the sourest of sour candies.

Phosphoric acid – This isn’t really a naturally occurring acid, but we consume huge amounts of the stuff, mostly in one particular form: cola. This particular type of acidity is often described as being relatively harsh compared to other acids, but it seems to provide excellent balance in cola drinks specifically.

Tartaric acid – This occurs naturally in many fruits like bananas, grapes and tamarinds. I confess I am probably most familiar with it as the primary acidity found in wine (along with citric, malic, ascorbic and many others).

Most of these acids can be bought easily in powdered form, and simple (low concentration!) solutions can be made for tasting. The tasting, and blind identification, of acids has become a staple part of coffee tasting tests for a variety of certifications.

Acids in Coffee

There are a great deal of different acids in green coffee, byproducts of a cycle of chemical reactions called the Calvin Cycle. Some of these survive the roasting process intact, but many don’t. The longer and darker that a coffee is roasted the lower the perceived acidity tends to be when that coffee is brewed and tasted. This seems pretty simple – but when you dive into the chemistry a little bit you will see that it isn’t quite as simple as that.

A variety of the acids we’ve already mentioned (citric, acetic, lactic, malic and phosphoric) have been identified in brewed coffee, but two others have as well (at higher concentrations than those already mentioned). They are:

Quinic Acid – While it usually is in crystalline form, quinic acids melts at around 160C and coffee that is being roasted will comfortably exceed these temperatures.  It is considered to add a positive acidity to the cup, and give coffees a “clean finish”.

Chlorogenic Acids (CGAs) – Chlorogenic acids (a group of acids, rather than just one) contain no chlorine. The name comes from the Greek χλωρός (light green) and -γένος (a suffix meaning “giving rise to”), because of the green colour produced when chlorogenic acids are oxidised.  These acids play an important role in the generation of flavours during the roasting process.

CGAs degrade quite dramatically during the roasting process, with around 50% of them gone by the time a medium roast is reached. As CGAs break down the byproducts are both caffeic acid and quinic acid.

This is designed as only a brief introduction, but we all want to go deeper…

Now it is your turn! Submit a link to further reading on acidity, and vote for whichever topic you would to see focused on next. The link can be about acidity in coffee specifically, or about acidity in general. It can be examples of tastings to try, or more about how we taste and how acidity interacts with other tastes and flavours. Anything and everything!

Further Reading

Here are the links submitted by readers, for those interested in learning more about acidity:

General Acidity

Taste: The sour and bitter story
Acidity (jpg)
Brewing Sour Beers at Home
What is the difference between tannins and acidity?

Acidity and Coffee

What is acidity in regards to the taste of coffee?
Coffee Chemistry Acids
Low Acidity Coffee Reviews
“Coffee Gone Sour”
A pinch of salt in your coffee, sir?
Brew temperature – 180 vs 200
Sourness and Acidity
Coffee and acidity: the science and experience
Coffee Chemistry – Acidity
Teaching to Taste
What’s geology got to do with it?
Prufrock – Coffee Science
I found my “roots” to coffee in Africa
Coffee Acidity

PDFs/Journal Papers

Effect of sugar on acid perception in wine (abstract)
A Structural Basis for the Biosynthesis of the Major Chlorogenic Acids Found in Coffee (full)
Alchemy in the roasting lab (pdf)
Improving the flavour of fruit products with acidulants (pdf)
Taste Receptors in the Gastrointestinal Tract III. Salty and sour taste: sensing of sodium and protons by the tongue (full)
Biosynthesis of Chlorogenic Acids in Growing and Ripening Fruits of Coffea arabica and Coffea canephora Plants (pdf full)


A worrying situation in Nyeri

Nyeri is a county in Kenya that produces some of the stunning coffees we’ve come to love. Coffee in the region is generally produced by small holders, rather than larger estates, which means we are used to seeing traceability down to the local factories (the term used in Kenya for a wet mill) that farmer’s societies choose to work with.

Recent changes to Kenya’s political structure has given more power to local counties, and in Nyeri there has been a proposed change that is  worrying. The governor of the county, Nderitu Gachagua, has announced that all of the coffee in the region shall be milled at a single mill (called Sagana) and the coffee should be pooled and sold through a newly formed company. The logic behind this is that the politicians believe that they can achieve higher prices for the coffee and pass those higher prices on to the producers. From a political perspective it should be noted that farmers are often the target of political manoeuvring in areas where they make up a large portion of the voter base, and this is very much the case in Nyeri.

While great Kenyan coffees produced by the mills throughout Nyeri can already be quite expensive, compared to many other sources of green coffee, there have long been challenges in making sure that the premiums achieved make their way to the producers. This is not a universal problem, by any means, but something that many producers are aware of. However I don’t think that reduced traceability like this, or pushing all of the coffee through one mill, will preserve the interests of growers who produce the highest quality coffee in the region. As a roaster, the idea of offering a coffee traceable simply down to Nyeri isn’t strongly appealing – and there several other regions in Central Kenya (and increasingly west of the Rift Valley) growing great coffees, with sufficient traceability. As traceability is a core tenet of my business this must factor into decision making and purchasing.

In an effort to further the political cause the Central Kenyan Coffee Mill (familiar to a great many speciality buyers) has essentially been shut down, and I’m sure I’m not alone in being extremely skeptical as to why and how this has been done.

While I am sure this centralising move does have some support in the farmer base, I do not think it is in the best interests of every farmer. 13 farmers’ societies have taken this to court to get an injunction, though their case won’t be heard until February 10th. That isn’t the best news considering the harvest has started.

As I’m based in Europe I suppose I should be looking to my trade association (SCAE) for advocacy and support in a situation like this, but I don’t think this will happen. Realistically I am hoping that the SCAA may have some opportunity to support the idea of retaining better levels of traceability. I’m sure we’ll see more information on this shared soon, but I thought spreading the word was a good idea.

In summary, I’m concerned that we’re going to lose some traceability (and potentially quality through separation) from some of the best coffees in the world. I’m concerned that legal wrangling, even best case scenario, could several delay the export of those coffees (not something anyone wants), and that this decision is being made my people who don’t really understand our sector of the market.


Mette- Marie Hansen also sent me this link. The whole thing is worth reading, but it is hard to ignore this bit.

The county government envisages a situation where once the coffee is milled, they can approach buyers and negotiate to supply either milled or roasted coffee at a premium price.

County Secretary for Agriculture Shadrack Mubea said earlier in the week that the governor was keen to explore potential markets, especially in non-traditional markets such as America and China.

Wilson Karime, the chairman of the Gititu Coffee Factory, which is under the four factory Aguthi Coffee Farmers Society, urged Nyeri farmers to give the governor a chance to prove his worth.

“The past model has favoured middlemen and buyers,” said Karime. “I see no harm in trying a new set if it finally benefits farmers.”

Emphasis added is mine. This is undeniably an approach that doesn’t understand the needs of speciality buyers, and doesn’t truly value quality.

Active and Passive Learning and a Project

I meet and chat to quite a lot of baristas and coffee people from all over the world. Often one of the topics that comes up is having a career in coffee and the idea of progressing. One of the most common avenues of conversation is learning, and I confess that from time to time the following sentence has been like a red rag to a bull:

“I think I am going to look for a job somewhere else, I don’t really feel like I am learning anything any more.”

To most people this may seem like a fair comment, but I want to explore the idea of learning at work and its purpose and value.

When you start your first serious coffee job (it might not be your first coffee job, but your first speciality coffee one) you go through a very intense learning experience. Learning like this feels great. Coffee seems big and exciting, and the learning is not only rapid but generally fun. Learning like this is very addictive and we all want to learn like this all the time, but that isn’t really viable – there’s work to do! We need to split the value of learning into two separate ideas here:

1. Learning is rewarding, and a motivating factor in performing and remaining in a job. The idea of mastery was best communicated to me by Daniel Pink in Drive, which is a great read about how to retain staff and motivate them to do good work.

2. Learning is a way to increase the value of a staff member. If time/money/resource has been spent on a staff member then, from a purely business perspective, this person should be able to generate more revenue and value as a result. In the simplest terms, if I teach you to brew espresso you go from being completely useless to a successful cafe, to someone who can produce products for sale. The more I train you then the more product you should be able to produce (you get faster and more efficient) or the more revenue you can generate (you can make more expensive drinks or upsell, or do good customer retention work).

The second type of learning is the responsibility of the business, to assess whether you are ready to learn more (you have achieved some level of mastery of your existing skillset) and then to deliver more training. After this there is a period of time when you should be mastering the new skills. Then there needs to be a period of time where you return on the investment of the employer. If you take your new skills and jump into a different job then the employer has no return on their investment. This will increasingly discourage them from further investment in staff, and over time lead to a stagnant work environment. Alternatively there may be requests for learning from staff, but no way for the business to recoup its investment as the learning may not have a practical application to that business.

The problem many people have is that in the period where you leverage your new skills for your employer, you generally stop learning. So you feel uninspired, restless and you start to look for other employment. I will accept that (and I include myself in this too) employers often do a bad job of setting out goals to met and expected time periods between the periods of advancement. (And in fairness to them, this is no easy thing to do).

This isn’t the only part of this that I find frustrating. Learning does not need to be passive. If you want to learn then there is a world of information out there, and a little effort will yield big reward. Staff who are active learners stand out very clearly in any business, not simply because of their demonstrated motivation. For quite some time I suffered mild imposter syndrome, because I felt that people thought I knew lots and all I had done is read things that had been published for free on the internet – something freely available to all. I should add that while I am pro active learning, I’m not a big believer in work cultures that expect you to stay late and be in early for no extra financial reward, in order to move up in an organisation.

My point here is not to try to generate sympathy for employers, but instead to try to encourage more active learning. This leads me to one of the things I’d like to do on the blog this year.

The Learning Project

Here is what I am proposing: a monthly topic of learning that allows people to get involved with it. The plan will be:

Month 1 (this month): Write a short introductory blog post on a certain topic (approx 1000 words). This will also have a link allowing you to submit an interesting link on this topic. When you’ve submitted a link you will then get to vote on which topic we cover the following month.

Month 2: Republish the initial blog post including all of the submitted links on the topic. Publish a short introductory topic on the group voted subject. Again, submit a link on it to vote on what we do next.

My goal would be to continue this same cycle month to month throughout 2014 (thus covering 12 topics).

I have no idea if it will work, but if it does it will be fun to take a journey around different topics and to not know where we’re going until we get there. It will certainly push me, and I hope others will benefit too.

If you think this sounds fun then do please get involved. When the first topic goes live please share it (the more incoming and suggested reading the better!), and any feedback is welcome on twitter.