Why That Roast Flattened in the Cup
The verdict is in: a roast that shone in cupping can vanish in the cup. This week, a Guji Ethiopian roast—roasted to 20% with a drop temp of 212°C—delivered bold blueberry and milk chocolate notes in the cupping, only to fade into blandness when brewed as a French press. The mystery? A perfect storm of timing, technique, and chemistry. Roasting is just the first act. Post-roast, beans need time to degas, releasing CO2 trapped during the process. If you brew too soon, the gas escapes during extraction, leaving a flat, underdeveloped cup. This roast was cupped Tuesday, brewed Wednesday—just a…