Coffee Roasting

Chapter 1: The Roaster's Mindset: Profiles, Data, and Repeatability

Let's get one thing out of the way immediately: roasting coffee is not magic. It is a sequence of physical and chemical events, each one triggered by a specific temperature, occurring at a specific rate, over a specific duration. If you treat it as magic, you will produce inconsistent results. If you treat it as engineering, you will produce coffee that tastes the way you intended, cup after cup, batch after batch.

I have roasted over 4,000 batches in the past twelve years. I have baked beans at 190°C (374°F) charge temperatures and watched them turn to straw-colored cardboard. I have scorched the faces of beans with a 260°C (500°F) drum that I failed to preheat properly. I have dropped a roast at 210°C (410°F) that tasted like burnt toast, and I have dropped one at 215°C (419°F) that tasted like grapefruit and honey. The difference was not luck. It was data. Every one of those mistakes is logged in my roasting notebook, and every one of those successes is logged right next to it. This book is the accumulated result of those 4,000 batches, distilled into a system you can use at your own bench.

The core mental model is simple: roasting is a series of measurable events, and your job is to control the timing and temperature of each event. You are not "developing flavors" in some vague, artistic sense. You are driving a chemical reactor. The reactor happens