Espresso
Espresso forces hot water through a tightly packed puck of finely ground coffee at around 9 bar. The result is a small, thick, concentrated drink with crema on top, and it's the base for lattes, flat whites and americanos. It's the least forgiving brew method: small changes in grind, dose or puck prep show up right away in the cup. A scale and a good grinder matter more than the machine.
Water by roast: light 95 °C · medium 93 °C · dark 90 °C
Steps
- PrepTurn the machine on and let it heat fullyMost home machines need 20-30 minutes for the group head to stabilise
- PrepFlush the group head for 2-3 seconds and wipe the basket dry
- PrepGrind 18 g into the basket, break up clumps, and level the bedA WDT needle tool helps a lot with clumpy grinders
- PrepTamp level and firm, then lock the portafilter inStart the shot right away so the puck doesn't sit on the hot group
- 0:00Start the pump and the timer at the same time
- 0:06First drops should appear around hereDark, slow drips that turn into a steady stream
- 0:20Watch the stream colourIt lightens from dark brown to blond as the shot finishes
- 0:28Stop the pump at 36 g in the cupAim for 25-32 seconds. Faster means grind finer, slower means grind coarser
Variations
RistrettoLa Marzocco Home (Ben Blake & Scott Callender)
A short 1:1 to 1:1.5 shot. Heavier body and more syrupy, with less clarity. Works well with darker roasts and in milk drinks.
18 g · 24 g water · 90-93 °C · fine (same as your normal shot, or a touch finer)
- PrepDose 18 g, distribute, and tamp as normal
- 0:00Start the shot
- 0:07First drops
- 0:20Stop at 18-27 g in the cupCutting the shot early is what makes it a ristretto. Grind finer if it races past 27 g too fast
LungoLa Marzocco Home (Ben Blake & Scott Callender)
A long 1:3 to 1:4 shot. Lighter body and more clarity, so individual flavour notes are easier to pick out. Good for light-roast single origins.
18 g · 63 g water · 93-96 °C · fine, a step or two coarser than your normal shot
- PrepGrind slightly coarser than your normal espresso, dose 18 g, tamp
- 0:00Start the shot
- 0:06First drops
- 0:38Stop at 54-72 g in the cupIf it goes past about 45 seconds and tastes harsh, grind coarser
Turbo ShotBased on Cameron, Hendon et al., 'Systematically Improving Espresso', Matter (2020)
Smaller dose, coarser grind, lower pressure (about 6 bar), and a fast 15-second shot. The paper found fine grinds cause uneven flow and wasted coffee. Sweeter and clearer, but thinner. Best with light roasts. The 6 bar detail comes from how the home espresso community adopted the idea, not from the paper itself.
15 g · 40 g water · 93-96 °C · medium-fine, clearly coarser than normal espresso
- PrepSet pump pressure to about 6 bar if your machine allows itNeeds an adjustable OPV, a pressure paddle, a flow-profiling machine, or a lever
- PrepGrind 15 g much coarser than usual, distribute, and tamp
- 0:00Start the shot
- 0:03Flow starts almost right away
- 0:15Stop at about 40 gAim for 12-18 seconds. Running fast at 9 bar without the coarser grind is just an under-extracted shot, not a turbo
Fix your cup
| Taste | Cause | Fix |
|---|---|---|
| Sour, salty, thin | Under-extracted, shot ran too fast | Grind finer, or raise the yield a little |
| Bitter, dry, ashy | Over-extracted, shot ran too slow | Grind coarser, or cut the shot shorter |
| Sour and bitter at once | Channeling (water found a crack in the puck) | Improve distribution, tamp level, check for clumps |
| Watery, no body | Dose too low or grind too coarse | Fill the basket to its rated dose, grind finer |
| Shot spurts or sprays from a bottomless portafilter | Channeling or an uneven tamp | Use WDT, tamp level, check the basket isn't overfilled |
| Harsh even at a good time | Water too hot for the roast, or stale beans | Drop temperature 2 °C, try fresher coffee |
Tips
- Weigh both the dose and the yield every time. Volume markings on cups are not accurate enough.
- Change one thing at a time. Grind is the main dial. Keep dose and yield fixed while you dial in.
- Start at 1:2 (18 g in, 36 g out) in about 28 seconds, then taste and adjust.
- Light roasts usually want hotter water (94-96 °C) and longer ratios. Dark roasts do better cooler (90-92 °C) and shorter.
- Distribute the grounds before tamping. Clumps cause channeling, and channeling causes sour and bitter at the same time.
- Coffee is often best 7-21 days after roasting for espresso. Very fresh beans can gush and spurt.
- Purge the grinder of a few grams if it's been sitting, since stale grounds in the chute can throw off the first shot.
Common mistakes
- Judging a shot by time alone. Time is a guide; taste and yield decide.
- Using pre-ground coffee or a blade grinder. Espresso needs a burr grinder that can make small steps.
- Pulling a shot before the machine is fully warm. The first shot of the day often tastes sour for this reason.
- Changing grind, dose and ratio all at once, then not knowing which change helped.
- Tamping crooked. An angled puck lets water run down the low side.
- Leaving the portafilter out of the group head between shots, so it cools down.
What you need
- Espresso machine (pump, about 9 bar)
- Espresso-capable burr grinder
- Portafilter with double basket (18 g)
- Tamper
- Scale that reads 0.1 g
- Timer
- WDT tool or distribution tool (optional)