Archive for the ‘Roasting’ Category

Explanation of yesterday’s graph

Sunday, January 15th, 2012

So yesterday I posted up a little graph to see if people could identify it.  It was a tricky one, and I was pleased when Kevin Cuddeback, CEO of Gimme! Coffee, chimed in with the correct answer.  What the graph represents is the rate of increase of temperature in the bean mass (calculated to be per minute) measured every 30 seconds in a roast.  I removed the first part because formatting a graph to look nice when you’ve got to drop to -100 on your x-axis is difficult.  Plus, it would have made things too easy!

Here is the graph again, properly labelled:

I posted this for a couple of reasons:  Primarily I thought it was interesting.  Secondly I wondered if other people were looking at roast data like this.  I’ve only produced a few of these curves, as I have to do it manually at the moment, and they are confusing to read.  Bear in mind – if the graph were to flatten out it would simply mean that the bean mass is increasing in temperature at a steady rate.  The roast curve would be point up, it would just be straighter.

Other roasts have produced extremely different profiles.  I need to get more data and start doing comparisons!

This is also interesting because there are changes in the rate of the bean mass absorbing heat that don’t correlate to changes in gas or airflow.  I don’t know whether evaporative cooling has much impact on rate, or why we don’t see a faster uptake of heat once the coffee is dry.  The curve on this roast between 6 and 8 minutes is particularly interesting to me.

I should note that this was a test, rather than production roast.  It was dropped not far past 1st crack, as you may surmise from the graph.  We have a colour meter but it doesn’t produce accurate Agtron numbers.  It cupped pretty well, but was out-cupped by a slightly different profile that I don’t have this kind of data for.  (Annoyingly)

Anyway – I thought it was interesting, and I hope it might generate some discussion – because we are really bad at openly discussing roasting theory online.

Why I’m not a roaster

Saturday, January 7th, 2012

Whoever is doing the PR work for the position of production roaster deserves a bonus. I can’t think of another position that is as widely coveted within our industry. Roasting seems so creative, so romantic, so artful. We talk about hand roasting, or small batch roasting, or emphasise the craft of it all the time. Roasting is often seen as the pinnacle of the coffee industry, or certainly up there with being a buyer.

Personally I would think an accurate description of coffee roasting would be food manufacture.

Whether you see the roasting process as being transformational and an act of creation, or you see it a necessary step that shouldn’t hinder the transparency of the raw materials qualities – what makes a great production roaster is the ability to pay attention to detail, to be focused, and to do exactly the same thing time after time after time. A great roaster should be working to replicate a desired roast curve, and only deviate once feedback from the cupping table prompts a change. Consistency, not creativity, is at the root of the job description. Yes, there is cupping – lots of it. This is also a time when people basically look for flaws in what you’ve done (as well as commend great roasts). Roasting is hard on the ego if you’ve got a great group of cuppers giving you feedback.  Roasting the same coffees over and over doesn’t offer some immediate insight into coffee generally.  You still need to taste many different coffees, cup a lot and brew a lot.

I’ve roasted enough to know that I am not a great roaster. I certainly wouldn’t hire me to roast coffee for a living.1 I don’t have the attention span, the strength of mind. I have lots of stupid ideas for experiments, and in production you can’t whimsically mess around with a roast and then pass along experiments, that may well be awful, without warning to and consent from the customer first.  Don’t get me wrong – I’m extremely interested in roasting, I want to understand the process, I want to better connect a roast curve to a cupping bowl.  I’ve spent a lot of time reading about the chemistry, and I enjoy discussions with other roasters very much.  This isn’t enough to make me good at it for a living.

This isn’t me saying I don’t believe in experimentation – but this should have its own budget and time set aside, and shouldn’t be incorporated into production schedules.

Thankfully I work with people who are great at production roasting, and I hope they enjoy what they do.  (They also have the patience to put up with my sideline dabbling/ temper my attempts at backseat roasting!)  If you know what you are in for then I think roasting can be extremely satisfying.  The best thing is that you make things: At the end of the day there are shelves full of bags and boxes of stuff that you helped make – the creation of a physical product is so wonderfully pleasing and no empty inbox or spreadsheet can compare with that satisfaction.

I think we need to be more honest at what roles entail, and what they’re like to work. It doesn’t work for employer or employee to find out after 3 months that a role doesn’t work. Time, effort, training, money are expended and it is back to square one for everyone. When the right person finds the right role then you have lasting job satisfaction, and the company and the individual flourish.

I should probably add that production roaster can mean many things – with different levels of responsibility and opportunity to provide input into how the coffee is to be roasted.

If you want to be a roaster – then maybe see if you can just hang out with a roaster who is hiring for a couple of days. Do what they do. Get some genuine insight into that process. This is also one of the reasons I think a lot of people transition to roasting from another role in the same company – chances are they have a pretty good idea of exactly what is involved.

Also – learn to like lifting heavy things…

If anyone reading this happens to be a production roaster – I’d love to hear your thoughts?

Footnotes:
  1. You may ask – if I have nothing to do with production – exactly what is it that I do at work all day…. []

The future of speciality coffee

Wednesday, May 4th, 2011

It was hard to listen to the various presentations at the SCAA Symposium this year without thinking about what it would mean in real terms for quality coffee in the future.
I don’t profess to make particularly accurate predictions (the various annual efforts on here stand as testament to that). However, based on the various talks I would make the following guesses:

A shift in production away from diversity

Currently about 60% of the world’s coffee comes from just 4 different producing countries. I hadn’t realise the distribution was stacked that way, but these are countries that are able to apply new technologies relatively easily that will allow even greater yields without expanding the area given up to grow coffee.

My prediction (in between 10 and 20 years) would be that 60% from 4 becomes 80% from those 4 countries. Right now there is a lot of incentive to grow coffee in Brazil. Not only are prices high but exchange rates make their currency even more valuable. This will spur greater investment and a significant bump in yield. The majority of this coffee will be poor to average. Variety/genetic research will focus on palatability of product, rather than excellence.

Coffee is chased up the mountain

Climate change means that coffee growing at current altitudes will be decreasingly possible and rewarding. Farmers at lower altitudes will likely switch crop to something more stable and less affected by disease and temperature (palm oil etc). Those that can grow coffee higher up, where temperatures remain cooler, will continue to do so. However, this reduction in planted area for coffee (as well as a hopeful focus on quality in order to make a sustainable living) will make coffee grown at altitude increasingly expensive.

Climate change figures (esp likely temp changes) seemed to vary at Symposium, but I hope Dr Peter Baker’s presentation will be made available as it was both informative and compelling. No one seems to be arguing the base fact that less land will be viable for speciality coffee in the future.

Diversity in speciality coffee

Throughout Central America, some of South America and East Africa I expect to see less total coffee being produced – especially less speciality coffee. This will drive up prices further but I think we’ll see some truly exceptional stuff as we learn more about producing higher cup quality on purpose. (Looking to the GCQRI on that one….)

If you retail coffee then start thinking about how you’ll see it when it doubles in price. I think it will, and will be sustainable there too. The gap between speciality and commodity will widen significantly. I think genuine speciality (some would say high-end speciality) will also break away from the broad church that we cover with the term “speciality coffee” today.

GMOs

We’re going to see GMOs in coffee. I don’t like it, you probably don’t like it, nobody wants to talk about it, but I think these will likely appear first in the big 4 producing countries where there is greater need for economic stability from the coffee trade.

I hope that speciality works contrary to this to start to mine the genetic diversity in nature to see if we can’t find what we need there.

In summary

I don’t think fantastic coffee is going to disappear despite the challenges it faces. It is going to become increasingly scarce and its cost of production on top means that we’ll see a much bigger divide between C-market (which will likely drop back) and Speciality. You’ll have to fight to find it and buy it.

Whether you can plan that far ahead about how to be effective in a market that different, I don’t know. It is certainly worth some thought.

I’d be interested to hear from anyone else who was at Symposium, or who is interested in this sort of thing, about how wrong they think I am!

Cupping: From Raw to Ready

Wednesday, November 17th, 2010

Today at the roastery we had a very interesting cupping. We had pulled out a sample from the roast every minute, starting five minutes in and ending at around 15 minutes. This is not a particularly new idea – full credit to Tom at Sweet Marias. His video of it here is worth watching, especially as I am not really going to talk too much about how each bowl tasted.

(more…)

Sugars in roasted coffee – a conversation

Friday, August 6th, 2010

I’m posting this (with consent of the other conversants) in an effort to kickstart some more open discussion about roasting. Right now there is very little out there when it comes to roasting speciality coffee. I am aware that most of the studies quoted below were probably done on C-grade coffees.

I hope we can get to a place where we can discuss profiling, roast development, densities and the like with a view to understanding what we do better and to reduce the time we put into trial and error profiling. Undoubtedly lots of great roasters aren’t just heating and hoping – they are applying a lot of what they’ve gained from previous experience and other knowledge. (more…)

More on density

Friday, May 15th, 2009

I had a brief moment to dig into a couple of books and was pleased to come across the following passage in  Coffee: Recent Developments  that was very kindly sent to me by Jim Schulman.

(more…)

A grand unified theory of espresso

Thursday, May 7th, 2009

Not too long ago I posted on Home Barista about trying to find a good way to measure the density of coffee beans. 1

As always the paricipants there were way smarter than me and offered several interesting options. I dropped into the thread that this was part of my idea of a grand unified theory of espresso, and subsequently a few people mailed and pm’d me asking what on earth I was talking about and what density had to do with it.

Well, I should probably explain what I have been thinking. 2

(more…)

Footnotes:
  1. There really is no better place on the web for these kinds of questions! []
  2. Some of this is based on personal preference, some on what seems to be fairly well agreed upon within the community of people who worry a lot about their espresso. []