Ethiopian coffee is the easiest to roast. It's very well behaved in the drum, responds well to a variety of heat levels, and is super predictable.
Ethiopian washed coffees are what you should practice before doing Gesha, and then take off 15 to 30 seconds post first crack and use that as a starting point for Gesha.
For Ethiopian naturals, you can go anywhere up til the start of second crack - I like them most with 1:30-1:45 of development time, they end up being so sweet. Lots of airflow during the roast is helpful with naturals, and make sure they don't race (your drum temp should go up increasingly slowly - what roasters call a consistently declining rate of rise). That Kayon Mountain natural is one of my favorite espresso components, especially when left in the roaster for a good long while after 1cs.
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