What espresso actually is
Espresso is coffee brewed by forcing hot water through a compacted bed of finely ground coffee at roughly 9 bars of pressure. The result is a small, concentrated shot — around 25–40 g of liquid — with a layer of crema on top. Because the extraction happens in under 30 seconds through a very fine grind, every variable is magnified: a grind change that would barely register on a pour over will completely change an espresso shot.
The equipment that matters
The grinder matters more than the machine. Espresso needs a fine, consistent grind that can be adjusted in tiny steps. A capable burr grinder with a mediocre machine will beat a great machine fed by a blade grinder every single time. If you're budgeting a setup, put half the money into the grinder.
A scale is not optional. Espresso recipes are built on weights — dose in, yield out. Eyeballing either one makes dialling in impossible. Any 0.1 g kitchen scale that fits under your cup works.
The machine needs stable temperature and pressure. Beyond that, most of what you pay for is convenience and consistency, not better coffee.
The starting recipe
- Dose: 18 g of coffee in a double basket
- Yield: 36 g of liquid espresso (a 1:2 ratio)
- Time: 25–30 seconds from pump start
- Temperature: 93 °C, if your machine lets you set it
This is the standard starting point for medium roasts. Light roasts often shine at longer ratios (1:2.2–1:2.5); dark roasts at shorter ones (1:1.8–1:2).
Pulling the shot, step by step
1. Dose and distribute. Grind 18 g into the portafilter. Break up any clumps and level the surface — a WDT tool (a few fine needles) or a gentle tap does it. Uneven coffee extracts unevenly no matter how good the tamp is.
2. Tamp level. Press firmly and evenly. Level matters far more than pressure — a tilted puck gives water a thin edge to channel through.
3. Pull. Lock in, put your cup and scale under the spouts, and start. Espresso should appear after 5–8 seconds as a slow drip that builds into a steady, honey-like flow.
4. Stop at your yield. Kill the shot at 36 g on the scale. Note the time: 25–30 seconds is the target window.
5. Taste and adjust. Sour and fast means grind finer. Bitter and slow means grind coarser. Change only the grind until the timing is right — then use taste to fine-tune.
Reading the shot by taste
Sour, sharp, thin: under-extracted — the water ran through too fast. Grind finer.
Bitter, harsh, hollow: over-extracted — too much contact time or too much heat. Grind coarser, or drop the temperature a degree or two.
Balanced but weak: lengthen the ratio slightly or increase the dose by 0.5 g.
Once you can pull the same balanced shot twice in a row, you're ready for the full dialling-in process — and if your shots are gushing through in 15 seconds, start with espresso pulling too fast.