Coffee Roasting: Heat, Time, and Flavor
Move beyond color presets to master real-time thermal curves and airflow dynamics. Learn how to diagnose roast defects, adapt profiles to bean densities, and steer internal coffee chemistry for your target brew method.
Like Duolingo, but for Coffee Roasting: Heat, Time, and Flavor. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
25 levels across 4 sections, about 50 minutes end to end, roughly 10 days at five minutes a day. It moves through Controlling the Roast in Real Time, Diagnosing and Refining the Cup, Adapting to Bean and Brew, and The Internal Chemistry of Heat and Flavor. It assumes you already know the basics.
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Key ideas in Coffee Roasting: Heat, Time, and Flavor
- Cold beans immediately absorb heat the instant they drop into the hot roasting drum
- The turning point reflects the probe catching up to the mixed environment, not bean physics
- Heavy or slow-responding thermocouple probes artificially delay the recorded turning point
- A low charge temperature starves the batch of baseline thermal momentum early on
- Compensating by cranking the burner late risks scorching bean surfaces without heating cores
- Charge temperature must match batch size and bean density to establish adequate drum inertia
- A continuously declining RoR ensures inner bean development matches outer bean color.
- An RoR flick or late spike scorches delicate aromatics and imparts harsh, bitter notes.
- A flatlining or crashing RoR stalls caramelization and yields dull, baked cup flavors.
- A low charge temperature starves the batch of baseline thermal momentum early on.
- Airflow pulls out shedding chaff and volatile smoke before they impart dirty flavors.
- The turning point reflects the probe catching up to the mixed environment, not bean physics.
- Increasing air too aggressively robs the drum of energy and stalls bean temperature rise.
- Raw green beans first soften and lose moisture, taking on a pale green-white appearance.
- The yellowing transition indicates free moisture loss and the end of the drying phase.
- Hay and steamed-vegetation aromas give way to baked bread and toast as browning begins.
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Coffee Roasting: Heat, Time, and Flavor the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
What does the turning point on your roast curve actually show?
Get it right to open this lesson and 24 more in the app.
Where Coffee Roasting: Heat, Time, and Flavor takes you
- 1
Controlling the Roast in Real Time
- Navigating the Thermal Curve
- Managing First Crack and Development
- 2
Diagnosing and Refining the Cup
- Sensory Cupping for Roast Defects
- Iterating and Correcting Profiles
- 3
Adapting to Bean and Brew
- Adjusting for Density, Process, and Moisture
- Tailoring Profiles for Filter vs. Espresso
- 4
The Internal Chemistry of Heat and Flavor
- Maillard Reactions and Caramelization Dynamics
- Organic Acid Breakdown and Cellular Structure
4 sections · 8 units · 25 levels. Built to play, not to enroll.
You pick the voice
Coffee Roasting: Heat, Time, and Flavor is taught in the The Bestie style: your friend who just gets it. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start Coffee Roasting: Heat, Time, and Flavor today.
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