Brewing guide
Espresso
Nine bars of pressure forcing hot water through a compact puck of fine grounds — coffee at its most concentrated and demanding.
The setup
Espresso isn't a bean or a roast — it's a method: roughly 9 bars of pressure (about nine times atmospheric) driving water through finely-ground, tightly-tamped coffee in 25–30 seconds. That intensity extracts a syrupy shot crowned with crema, the hazelnut-colored foam of emulsified oils and CO₂. It's also the least forgiving brew in coffee: a grind adjustment of microns swings the shot from sour to bitter.
You'll need:
- Espresso machine with a pressurized group (9 bar)
- A capable burr grinder — this matters more than the machine
- Portafilter, tamper, scale, timer (a 0.1g scale ideal)
The three numbers to track: dose (coffee in), yield (espresso out), and time.
Recipe — the 1:2 ratio
| Variable | Target | Note |
|---|---|---|
| Dose | 18g | Level, distributed, tamped flat |
| Yield | 36g | A "normale" — 1:2 by weight |
| Time | 25–30s | Start the clock when the pump engages |
| Temp | 93°C | Cooler for dark roasts, hotter for light |
Dial in by holding dose constant and adjusting only the grind:
- Shot pulls too fast (under ~22s, sour, thin) → grind finer.
- Shot pulls too slow (over ~32s, bitter, dark) → grind coarser.
Time your shot
Espresso shot (18g → 36g) timer
0:30of 0:30
Ready
Next: Pump on at 0s
Press Space to start/pause.
- 0sPump on+0ml
- 10sSteady flow+0ml
- 27sReaching 36g+0ml
Common mistakes
- Chasing the machine, ignoring the grinder. A great grinder on a modest machine beats the reverse.
- Uneven tamping or distribution. A tilted puck channels — water blasts through the weak spot and the shot tastes both sour and bitter at once.
- Skipping the scale. "By eye" yields drift; weigh in and out every time while learning.