Espresso at home for beginners: dose, yield, time, dialling in and steaming milk

TUREFF• •0

Espresso is the hardest home brewing method to get right, but it becomes much less mysterious once you see it as a recipe with three numbers: how much coffee goes in, how much liquid comes out, and how long it takes.

What you need

An espresso machine with a portafilter.
A grinder that can grind fine enough for espresso and adjust in small steps. This matters as much as the machine.
A scale that reads to 0.1 g and fits under the cup.
A tamper, and fresh beans with a roast date.

The three numbers

Dose: the dry coffee in the basket. 18 g is a common starting dose for a double basket; check the size your basket is made for.
Yield: the weight of espresso in the cup. Weigh it rather than judging by volume, because crema makes volume misleading.
Time: from starting the pump until you stop it.

A widely used starting recipe is 18 g in, about 36 g out, in roughly 25–30 seconds. That is a 1:2 ratio. Lighter roasts often taste better with a longer ratio (more water); darker roasts often suit a shorter one. Treat these numbers as a starting point, not a rule.

Preparing the shot

Weigh and grind the dose.
Distribute the grounds evenly in the basket, breaking up clumps.
Tamp level and firmly. How hard matters less than being level and consistent.
Lock in the portafilter, put the cup on the scale and start the shot straight away.
Stop when the scale reaches your target yield, and note the time.

Dialling in

Grind size is your main control. Keep the dose and yield fixed and adjust the grind.

Too fast and sour, thin, sharp: grind finer.
Too slow and bitter, harsh, ashy: grind coarser.
In the right time but still sour: try a slightly longer ratio.
In the right time but still bitter or heavy: try a slightly shorter ratio.

Change one thing per shot and taste every one. Expect to use a few shots each time you open a new bag; that is normal, not failure.

Common problems

Spurting or a pale, fast shot: often uneven distribution or a channel through the puck. Distribute more carefully.
Sour shots no matter what: the machine may not be up to temperature yet. Let it warm up fully.
Shots changing day by day: beans change as they age; small grind adjustments are expected.

Steaming milk basics

Use cold milk in a cold jug, filled to just below the spout.
Purge the steam wand to clear water.
Place the tip just under the surface and open the steam fully. You should hear a gentle tearing or hissing sound as air goes in.
Add air only at the start, while the milk is still cool, more for a cappuccino, less for a latte or flat white.
Then lower the tip slightly so the milk spins in a whirlpool, which breaks big bubbles into fine, glossy microfoam.
Stop when the jug is hot to touch. Many baristas aim for roughly 55–65°C; above about 70°C milk starts to taste scalded and loses its sweetness and fine foam.
Tap the jug, swirl it until glossy, and pour straight away.
Wipe and purge the wand immediately, before milk dries on it.

Milk drinks in brief

Cappuccino: espresso with steamed milk and a thicker layer of foam.
Latte: espresso with more milk and a thin layer of foam.
Flat white: a smaller drink than a latte with thin, velvety microfoam, so the coffee comes through more.

Café sizes and recipes vary, so these names are guides rather than fixed recipes. What machine are you learning on, and what is your current recipe? Post your numbers or your problem shot in the comments and others can help you dial in.