How to Dial In Espresso: One Recipe, One Change at a Time

What you get: a written recipe for one coffee on your semi-automatic machine that you can repeat tomorrow. What it costs: several shots of that coffee. At 18 g a shot, a 12 oz (340 g) bag holds about 18 attempts, and you don't need most of them.

You need a grinder with small enough steps, a scale that reads to 0.1 g, and a timer. The scale can do both jobs if it has one built in, as the Maestri House S2^* does per its listing. Keep a note of each shot on paper or your phone.

The recipe is a starting point

Breville's guide starts you at 18 to 22 g, a 1:2 ratio and 25 to 30 seconds, and adds that a good shot can fall anywhere from 20 to 40 seconds. Many people repeat this as if it were a rule. It's a good first recipe, not a standard. Italy's certified espresso is 7 g to 25 ml, in 25 seconds give or take 5, at water of about 190 °F (88 °C). Different cup, same word.

So use 1:2 because it gives you a fixed target, not because anyone certified it. Set your own dose here and read the yield:

Dial in step by step

1. Fix the dose

   Weigh your dose and keep it the same for every shot in the session. 18 g is the low end of Breville's 18 to 22 g range, and your basket decides what fits. Breville names 18 g for the 54 mm Barista Express and 22 g for the 58 mm Dual Boiler.

2. Set the yield

   Take 1:2 as the first target, so 18 g in means 36 g in the cup. Stop the shot when the scale reaches that weight, whatever the clock says. The yield is your constant and the time is your readout.

3. Grind and prepare the puck

   Start at a texture close to fine table salt. Distribute evenly, press until the coffee stops compressing, and keep it level. Do it the same way every time, because a change in your puck looks just like a change in your grind.

4. Pull and record

   Time from the start of the brew cycle, as Breville does. Write down dose, yield, time and grind setting, then taste the shot before you touch anything.

5. Change the grind only

   If the shot ran fast and tastes sour or thin, grind finer. If it ran slow and tastes bitter, grind coarser. Change nothing else, and pull again.

6. Stop when it tastes good

   Aim for 25 to 30 seconds, and accept anything from 20 to 40 if you like the cup. To refine it, move the ratio or adjust the dose by a gram or two. Then save the recipe with the coffee's name and roast date.

Where to set the grinder first

Breville's starting point is a texture close to fine table salt, and it notes that darker roasts call for a finer grind. Feel helps you get into the right area on a new grinder. After that, trust the scale and the clock. Grind is the first thing to change when the timing is off.

What the shot is telling you

Breville ties fast shots to a sour, thin cup and slow shots to over-extraction. “Bitter means coarser” is the common shorthand for the second part, and it works as a first step.

The fourth row is the exception most guides leave out. Cameron and colleagues (Matter, 2020) measured extraction rising as the grind got finer, then falling again at very fine settings, and attributed the fall to uneven flow. We read only the abstract, so we keep to what it says: sour means finer as a first step. First step, yes. If you are already very fine and it stays sour, go coarser.

Common mistakes

• Changing two things at once. Breville's guide says to change one variable and hold the rest. If you move grind and dose together, you learn nothing from the next shot.
• Tamping harder to slow a fast shot. Press until the coffee stops compressing, and keep it level. Force above that adds nothing measurable in the one test we found: Seven Miles pulled “a total of 25 shots of espresso at 10, 20 & 30kg” and saw no difference.
• Chasing the clock. A shot at 34 seconds that tastes good is a good shot.
• Judging by crema. Crema shows CO2, so freshness and roast. It says little about flavor.
• Dialing in on a starter basket. If your machine came with a starter filter and traditional ones, use a traditional one here. Gaggia's Classic Evo manual calls its “crema perfetta” filter the one for first-time use and says the traditional filters take skill and experience. That skill is what you are building.
• Ignoring the rest of the setup. Breville also asks for filtered or mineral water and clean equipment. Keep both constant, or the recipe you worked out won't hold.

The two tools that make this easier

The method works on any machine, but it needs a grinder that can make small moves. If yours jumps from too fast to too slow between two settings, the grinder is your limit, and no technique will fix that. Our espresso grinder guide is the place to go next, and the accessories page covers the scale and the puck tools.

Once one coffee tastes right, the same recipe carries into milk. Flat white or latte is a good next read, and if you are still choosing a machine, start with our comparison by spec sheet.