Behind the Espresso Bar
Like Duolingo, but for Behind the Espresso Bar. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
For the part of you with thirty open tabs that never became anything.
21 levels across 3 sections, about 42 minutes end to end, roughly 8 days at five minutes a day. It moves through Mastering the Extraction; Milk Craft and Drink Execution; and Speed, Workflow, and Operations. It assumes you already know the basics.
Free forever · No credit card · iPhone & Android
Key ideas in Behind the Espresso Bar
- Locking dry dose weight and liquid yield isolates water resistance to grind size alone.
- Changing dose or yield simultaneously confounds which variable affected flow time.
- Adjusting only burr spacing allows direct, predictable control over contact time.
- Grinder adjustment mechanisms displace burrs before new grounds can pass through.
- Retention chambers hold stale grounds from the previous setting or prior day.
- Purging 2-4 seconds clears retained particles so the test shot reflects the new setting.
- Under-extracted espresso tastes sour, salty, and sharp, demanding finer grinding.
- Over-extracted espresso tastes bitter and creates an astringent, drying mouthfeel.
- Target extraction time is merely a guide; flavor balance confirms burr calibration.
- Rising humidity introduces moisture that swells coffee cells, slowing flow rate.
- Depleted beans in the hopper reduce downward column pressure, speeding up grind delivery.
- Grinder burr friction heats metal, shifting particle distribution over long service rushes.
- Roaster spec sheets are starting baselines, not rigid rules as organic beans age.
- Degassing reduces CO2 resistance in older beans, requiring finer grinds or tighter yields.
- Extending brew ratios slightly compensates for declining solubility in older coffee.
- Channeled water overdoses localized pathways, extracting harsh bitter tannins
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 Behind the Espresso Bar 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 happens if you adjust your dry dose and liquid yield at the exact same time as your grind?
Get it right to open this lesson and 20 more in the app.
Where Behind the Espresso Bar takes you
Step into the commercial cafe environment with the technical skills required of a working barista. Master grinder calibration, puck physics, milk microfoam, sensory extraction diagnosis, and high-speed bar sequencing.
- 1
Mastering the Extraction
- The Daily Dial-In Routine
- Puck Preparation and Channeling Prevention
- Sensory Calibration and Extraction Diagnosis
- 2
Milk Craft and Drink Execution
- Milk Texturing and Alternative Milk Chemistry
- Pouring Mechanics and Pattern Structure
- 3
Speed, Workflow, and Operations
- Rush Workflow and Station Ergonomics
- Machine Maintenance and Shift Close-Down
3 sections · 7 units · 21 levels. Built to play, not to enroll.
You pick the voice
Behind the Espresso Bar 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.
More Food & Drink on Tomo
Espresso: Dialing in the Perfect Shot
Move beyond the basic 'double shot' and learn to manipulate extraction variables like a professional barista. Master the art of dialing in to balance acidity, sweetness, and body in every cup.
Espresso Extraction and Service
Master the science of the perfect shot, from the physics of puck resistance to the nuances of water chemistry and high-volume workflow.
Espresso and Milk Craft
Move beyond basic brewing recipes and take deliberate control of your espresso machine. Diagnose extraction faults by taste, perfect silky microfoam texture, and dial in beans by roast profile.
Espresso Extraction and Technique
Bridge the gap between pulling erratic shots and consistently crafting cafe-quality espresso. Learn the mechanics of puck prep, extraction diagnosis, flow profiling, and microfoam chemistry.
The Craft of the Barista
Learn to brew cafe-quality espresso, steam silky microfoam, and master classic drink ratios. Build professional coffee bar skills through clear extraction math, step-by-step dialing recipes, and clean bar workflow.
The Craft of the Café
Move beyond basic brewing to master the precision of espresso extraction, sensory analysis, and the workflow of a professional barista.
Start Behind the Espresso Bar today.
Download Tomo, search Behind the Espresso Bar, and play your first lesson in under a minute.