Edited to add on July 27: I hope you view these videos:
7/27追è¨: 次ã®ï¼ã¤ã®ãããªãè¦ã¦ä¸ãã:
Coffee roasting with a perforated shallow pot, final version/ç©´ããã®æµ éã«ããã³ã¼ãã¼çç 、æçµç
Coffee roasting with a perforated shallow pot, Part 2/ç©´ããã®æµ éã«ããã³ã¼ãã¼çç 、ãã¼ãï¼
***
Coffee roasting is largely divided into two types, direct flame and hot air. I regard my way of roasting as the former, and I bring the pot as close to the flame as possible.
Here's a brief description of the coffee roasting procedure:
IMPORTANT: Take all the necessary measures to prevent fires.
Caution: The considerable amount of chaff that comes off the beans during roasting and during cooling is a major problem, so is the amount of smoke generated during roasting. I do the roasting in the garage. If you decided to roast coffee outdoors, make sure that the flame is not affected by wind.
Assumptions:
1. Your portable gas stove has a heating power of about 3 kW (2,600 kW/h).
2. The amount of green coffee beans to roast is 300-400 g in weight.
0. Get all the necessary equipment.
1. Remove defective beans and foreign objects.
(I rarely remove defective beans, except extremely bad ones. I do remove foreign objects such as small stones. I can easily detect defective beans after roasting, and I usually simply remove very bad ones just before grinding.)
2. Measure out the desired amount of coffee beans.
Note that green coffee beans will lose their weight when roasted by about 12 (light roast) to 20% (dark roast).
I usually aim for 14-15% by bringing the beans to the end of first crack. A weight loss of 16% or greater is dark for me.
3. Transfer the beans to the pot, and cover the pot almost entirely, not entirely, with aluminum foil to keep the atmosphere inside the pot moist in the drying phase while at the same time preventing the beans from becoming smoky and also making the beans visible. Be sure to wear leather gloves before starting to roast.
4. Start roasting: Turn on the stove to medium, press the start button of the timer, and bring the pot as close to the flame as possible. And, start shaking!
5. 2 minutes after the start of roasting: Check that no chaff starts to come off the beans (I mean, no chaff falls onto the stove through the holes). If it does, remove the pot from the stove immediately, turn down the heat to low, and start roasting again.
6. 3-4 minutes: Check that chaff starts to come off the beans.
7. 9 minutes: Check that first crack does not occur yet. If it does, remove the pot from the stove immediately, turn down the heat to low, and start roasting again.
8. 10 minutes: The drying phase is almost over. You may:
a. Turn up the stove to high at this point, and first crack will start soon, or
b. Keep drying the beans for another 2 minutes or so, and then turn up the stove to high, and first crack will start soon.
Note: I'm still a learner myself, and I can't give you definitive advise on when to stop the drying phase and move on to the chemical reaction phase. A lot of factors come into play, especially the weight of the coffee beans. All I can say is to watch the beans carefully to make the decision. Anyway, first crack should start 10-14 minutes after the start of roasting.
I can't talk about second crack because I've never brought my beans to second crack.
EDITED TO ADD: I totally forgot to write about when to remove the aluminum foil. Remove the aluminum foil when the drying phase is over OR remove it 1-2 minutes after the start of the chemical reaction phase. Again, watch the coffee beans carefully and make the decision.
9. Just when you think that your beans have been roasted to your desired level, transfer them to a sieve, and cool them immediately.
10. Measure the weight of the roasted coffee beans, and calculate the weight loss.
***
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