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Sunday, June 10, 2007
The beauty of the 'Double Roast'
A double roast is not something I would recommend for any good coffee. It's a roast where a normal profile is begun but as the coffee coffee progresses in drying to a point where it begins to gray, you dump it and cool the coffee. You then warm the roaster up to a much higher temp and drop the now cooled green back in and attempt to continue the roast. The resulting cup will be a polished, very low acid and extremely 'coffee' tasting coffee. It will have no fruit and little unique aroma, the roast flavors and the woody coffee notes will be all that remain of what is now an entirely generic coffee.
I guess I could understand this for someone roasting C-Grade who desired heavy body and low acidity. Then again you would wonder why someone like me would even be talking about this.
We were roasting today and were struggling getting efficient drying on what we believed to be a particularly good coffee. Knowing it was good made it more frustrating. At one point during a drop, a mistake in the flame setting caused the roast to begin to tail near the end of the drying phase. On the spot Ben decided to just dump it and cool it. He pulls out the old Japanese book on slow roasting and chronicles the 'delights' of the double roast. Having accomplished most of our goals for the afternoon, we decided to go for a double roast. A roast later, we had our double roast and a few new observations.
We pondered the exhaust and how the heating element was reacting with the barrel. Then it came back to the flue. Most roasters simply have an on or off while the Japanese and Taiwanese models have a variable control. Based on the discussions sparked by the double roast, we were able to ascertain we needed more efficient venting. Ten minutes of tinkering and we had a ghetto fabulous chimney fan combo increasing our drying efficiency. An ugly but entirely useful hack!
Sometimes things we know are dead ends are worth pursuing simply for the experience.
A double roast is not something I would recommend for any good coffee. It's a roast where a normal profile is begun but as the coffee coffee progresses in drying to a point where it begins to gray, you dump it and cool the coffee. You then warm the roaster up to a much higher temp and drop the now cooled green back in and attempt to continue the roast. The resulting cup will be a polished, very low acid and extremely 'coffee' tasting coffee. It will have no fruit and little unique aroma, the roast flavors and the woody coffee notes will be all that remain of what is now an entirely generic coffee.
I guess I could understand this for someone roasting C-Grade who desired heavy body and low acidity. Then again you would wonder why someone like me would even be talking about this.
We were roasting today and were struggling getting efficient drying on what we believed to be a particularly good coffee. Knowing it was good made it more frustrating. At one point during a drop, a mistake in the flame setting caused the roast to begin to tail near the end of the drying phase. On the spot Ben decided to just dump it and cool it. He pulls out the old Japanese book on slow roasting and chronicles the 'delights' of the double roast. Having accomplished most of our goals for the afternoon, we decided to go for a double roast. A roast later, we had our double roast and a few new observations.
We pondered the exhaust and how the heating element was reacting with the barrel. Then it came back to the flue. Most roasters simply have an on or off while the Japanese and Taiwanese models have a variable control. Based on the discussions sparked by the double roast, we were able to ascertain we needed more efficient venting. Ten minutes of tinkering and we had a ghetto fabulous chimney fan combo increasing our drying efficiency. An ugly but entirely useful hack!
Sometimes things we know are dead ends are worth pursuing simply for the experience.
Labels: musings, research, roasting
¶ Jaime van Schyndel 12:23 AM
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I'm interested in this hack but I'm having some trouble understanding it by looking at the photo. If you have time, could you explain it in more detail (sorry if I'm missing the obvious)?
Kapi snack can goes on top of the current exhaust in attempt to increase the chimney effect and increase air flow. Not sure if that ever worked since it's quite short (for a true chimney) and there was no way for us to measure the flow. Fan was added (yesterday) on top of the "chimney" to add forced air exhaust. Roasts prior to the mod only have natural convection exhaust.
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