(10-01-2022, 18:41)Dan_R Wrote: Aparatul atinge 160 grC cu boabe in 3-4 min. Dupa cum ma stii (expertimentez mereu), am incercat si varianta asta si nu a iesit rau deloc. Boabele aveau o culoare uniforma si mai putin bronzate, iar gustul cafelei OK. Mai jos redau reteta de pe roastrebels.com.
Double roast with Gene Café CBR-101
The second roast we have from the book "coffee roasting at home", which we can highly recommend. The author, Claus Fricke, is a pioneer of home roasting in Germany and also the importer of the Gene Coffee Roaster in Germany and so he gives in the book just for the Gene roaster many practical tips. He roasts in a 2-stage process:
- Heat beans for approx. 8 to 8:30 minutes at a target temperature of 160 ° C. So they are gently dehydrated. Then stop the roasting process and cool the beans quickly in a sieve. Let stand for 10 to 30 minutes.
- Pre-heat the roasting drum empty for 5 minutes at 200 ° C. Press the red button for 3 seconds to interrupt the process and remove the drum with a pot glove.
- Put the beans back in, temperature at 200 ° C and time at 18 minutes. Press red button to start roasting.
- After 5 minutes (13 minutes on the display), set the temperature to 240 ° C (only turn red button, do not press!)
- At about 6:30 minutes in the display, the coffee reaches the first crack. Now bring the temperature down to 210 ° C and roast the coffee to the desired degree of roast
- Cancel the roast, remove the butt with a glove and quickly cool the beans in a sieve.
Mulțumiri @Dan_R pentru rețeta de pe roastrebels.com. Am încercat cu o cafea verde Columbia. Nu pot spune că sunt foarte mulțumit... încă testez. Precizez că etapele menţionate mai sus, pot fi uşor scurtate, astfel: între etapa 1 şi 2, nu mai aştept 10-30 minute. Pun cafeaua sub ventilator de putere (sub o sită), timp în care deja ii dau aparatului preheat-ul de 200° C (~2-5 minute toată operaţiunea).
Poze & extracţia (n-am rezistat mai mult de 2 zile pentru degazeificat): https://imgur.com/a/JumDiW5
Citind recent un articol *Madihah et al., (2013), doresc să încerc proxima oară o prăjire cu temperatura de 167° C pentru 22:50 minute. E cam veche lucrarea, însă merită încercat.
Quote:Results obtained from this study indicates that volatile flavours compounds; 2-methylpyrazine and 2,5-dimethylpyrazine are the marker compounds that contribute to Arabica coffee flavour. Therefore, the optimized condition (time and temperature) for roasting of Arabica coffee beans is at temperature of 167.68°C for 22.50 min.
*Madihah, K. K., Zaibunnisa, A. H., Norashikin, S., Rozita, O., & Misnawi, J. (2013). Optimization of roasting conditions for high-quality Arabica coffee. International Food Research Journal, 20(4), 1623.
x2 Lelit PL41TEM // Giulietta X // Kinu M47 // Eureka Mignon // Lelit PL043MMI // Gene Cafe CBR-101

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