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Espresso and Milk

The two skills a café runs on. Dialling in a shot by dose, yield and time, and texturing milk that pours. The variables, the diagnosis, and the standard the SCA assesses against.

Skill levelSome coffee experience helpful
Time needed5–6 hours
Starter budget£25–40 for scales and a tamper, if you have a machine
Step 01

The espresso variables

The airgap coffee course is about brewing — pour-over, extraction science, getting a good cup at home without a machine. This one is about the other half of the craft, the half a café actually sells: espresso and milk. Almost nothing here overlaps, because espresso is a different problem. You are pushing water through a compressed bed of very fine coffee at high pressure in under half a minute, and every variable is fighting the others.

The recipe, in three numbers

Dose
The mass of dry coffee in the basket, in grams. Set by the basket size — an 18g basket wants roughly 18g. Weigh it; scooping introduces a variable you cannot then control for.
Yield
The mass of liquid espresso in the cup, in grams. Measured by mass, not volume, because crema makes volume meaningless. Dose to yield gives the ratio: 18g in, 36g out is 1:2.
Time
How long the shot takes, from pump on. Around 25–30 seconds is a common target for a 1:2 ratio, though time is a symptom rather than a control — you change grind, and time follows.
Grind
The primary control. Finer means more resistance, slower flow and more extraction; coarser means the opposite. Everything else held constant, grind is the dial you turn.

Why the ratio matters more than any single number

A shot is a compromise between strength — how much dissolved coffee per unit of water — and extraction, how much of the available material you have pulled out of the grounds. Push the ratio wider (more yield from the same dose) and you extract more but dilute; pull it tighter and you get an intense, less-extracted shot. 1:2 is a sensible middle. The point of writing the recipe down as three numbers is that it makes the shot repeatable, which is the entire difference between a café and a kitchen.

Espresso scales, 0.1g resolution with a timer

£20–40

You cannot dial in what you cannot measure, and this is the tool that turns espresso from guesswork into a process. 0.1g resolution for the dose, a built-in timer for the shot, and small enough to sit on the drip tray under the cup. The single highest-value purchase for anyone learning espresso.

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Tamping is about level, not strength

The received wisdom that you must tamp with 30lb of force is a distraction. What matters is that the bed is level and evenly compacted, so water cannot find a preferential path through it. Beyond enough pressure to consolidate the puck, extra force changes very little. Distribute the grounds evenly first, tamp flat, and put the effort into grind and dose instead.

Part ofBehind the Machine·Course 2 of 2

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