coffee roasting

Jun 2021

Ethiopian sidamo red cherry beans.  150g batches

75grams green beans x 2 pyrex dishes
8 + 8 mins in oven at 150 C (maybe too long, starting to go yellow) - oven fan not working..

remember to rotate the pyrex, and if possible give the beans a toss after every 4 mins

1st batch:

starting temp 280f

3 mins: 385f

5 mins: 400f (turned heat down at 5 and a half mins)

7 mins: 410f

first crack 7 min 20 sec

stopped at 9 mins: 427f

maybe a tad too dark - more for espresso

2nd batch: (fire seems lower, less yellow flickering)

starting temp 275f

3 mins: 372f

5 mins: 392f (turned heat down at 5 and a half mins)

first crack at 6 mins, but reduced heat too much..

7 mins: 380f!  

increased heat again

9 mins: 400f

10 mins: 412f (END)

DEC 2020:

Rwanda beans.  150g batches

75grams green beans x 2 pyrex dishes
15 mins in oven at 150 C

swap pyrex dishes around and give beans a stir after half the time has elapsed

first crack at 3 mins

first batch: 411F after 3 mins, 425F after 5 mins (stopped roasting)

2nd batch: 390F after 3 mins, 418F after 5 mins,  gave it another 30 seconds - 425F (stopped roasting)

i preferred the taste of 2nd batch - slightly lower fire

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ethiopian sidamo.  150g batches

1. oven dry at 160 C for 10 mins
medium gas for 8 mins?
ending temp 440F

cupping: nice, maybe best aroma when hot, grassy when tepid. the lightest tasting coffee.

2. oven dry at 230 C for 4 mins
high gas for 4 mins till first crack
low gas for 4 mins  - too low.  temperature stalled
ending temp 425F??

cupping: the most amount of grassiness when hot but ok when tepid.  drinkable.  a hint of acidity

3. high gas for 6 mins (until first crack)  - temp too high
medium gas for 4 mins
ending temp 430F

perhaps a bit fast?  try slower start - target 8 min first crack

cupping: easiest to drink.  a little flat.  least amount of grassiness. the most amount of bitter taste.  darkest roast.  very little acidity

Rwanda 150g green to 127.5g roasted  14.9% weight loss

fully hand roasted:
280F after 2.5 minutes
400F after 5 minutes
First crack at 6.25 minutes - (then heat lowered) and crack ended at 8 minutes
temperature reached 440F after 9 minutes

oven/hand roast:
preheat 2 pyrex dishes to 180C
75g beans into each dish for 2.5 mins, then toss the beans and roast for another 2.5 mins
bring out pyrex dishes onto a baking tray and bring them over to the stove for roasting
(pyrex dish will continue to keep the beans warm whilst being moved)

roasting over gas - first crack after 5-6 mins
Stopped roast at 9 mins upon reaching 440F