I roast in a Whirlypop stovetop popcorn maker, outside on a propane grill. It's too smokey to do it in the house. I roast 8 oz at a time. I get great results as long as I roast to full city or darker. It's really hard to get an even city or city plus roast. Fortunately, I usually prefer FC or FC+ and sometimes Vienna.
Roasting is very much a visual, aural, and olfactory art using this sort of equipment. You can't effectively profile your roasts, aside from timing, but even that is only general because you'll never reproduce the exact same conditions on subsequent roasts, especially when roasting on a propane stove outdoors.
But then, I really don't care about profiling or exactly reproducing a roast. What I care about is enjoying a satisfying cup of coffee, or shot of espresso, and I can do that with hundreds of variations in the final roast.
The only thing I don't like about roasting in the Whirlypop is I can only do 8 oz at a time. I go through a pound of coffee in five or six days, so I tend to do two back to back 8 oz roasts. It's a bit tedious, and I can't enjoy smoking my cigar as much with all that continuous cranking.
So I just bought a brand new grill a couple of days ago (it's still in the box, in fact) that will be dedicated to roasting coffee. I plan to buy the 4 pound RK drum and motor setup for it. I plan to fire it with natural gas, since I have a hookup in my back yard and nat gas is much cheaper than propane.
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