Forces hot water through a compacted puck of finely-ground coffee at high pressure, producing a small, concentrated, crema-topped shot in around 25-30 seconds.
Dose-to-yield ratio
1:1 – 1:2.5 (typically 1:2)
Grind
Fine, similar to table salt.
Water temperature
90-96 celsius (typically 93)°C
Contact time
20-35 seconds (typically 27)
Skill level
advanced
Espresso is measured as dose to yield: one part dry coffee to that many parts of liquid beverage in the cup — so 18 g of coffee at 1:2 gives about 36 g of espresso. It is not the coffee-to-water ratio used for filter brewing, which counts the water going in. The espresso ratio calculator works either direction for your own dose.
Descriptive grind labels like this are illustrative starting points, not precise measurements — the same label can mean different particle sizes on different grinders. See the grind size guide for how to dial this in on your own equipment.
Expected flavour profile
Produces a small, dense, syrupy shot with a reddish-brown crema layer, high perceived body, and a concentrated sweetness-to-bitterness balance. Pressure extraction pulls more solubles and emulsified oils into the cup than gravity-fed methods, which is a large part of why espresso tastes noticeably heavier and more intense than the same coffee brewed as filter.
Derived from CoffeeHQ's own Change the Taste guidance for this method, not a marketing feature list.
Grind size
Brew ratio / yield
Water temperature
Cleaning, prep or maintenance
Dose
Freshness
Water amount
Milk amount
Pre-infusion
Change the taste
Tastes sour
(Espresso machine)
The shot tastes sour, sharp or salty rather than balanced — usually under-extraction.
Try the first step below on its own, taste, then move to the next one only if needed.
Change
Try
Why
Watch for
FirstGrind size
Decrease: a small step finer
Increases resistance, slows flow and usually raises extraction.
—
Brew ratio / yield
Increase: extend the yield slightly for the same dose
A longer shot at the same dose usually extracts more.
—
Water temperature
Increase: a small step up, within the machine's normal range
Hotter water extracts more quickly.
—
Cleaning, prep or maintenance
Check / reset: check for channelling — check puck prep and distribution
Channelling can taste sour even at a correct grind; the fix is even distribution and tamping, not more grind change.
—
"Strong but sour" is not fixed by pulling less coffee — it needs more extraction (finer grind, longer yield or a touch more heat), then dilute afterwards with water if it's too intense.
When to reset: Return to your usual dose, grind and yield before making a second change.
The shot tastes correctly balanced but too intense to drink as-is.
Try the first step below on its own, taste, then move to the next one only if needed.
Change
Try
Why
Watch for
FirstWater amount
Increase: add hot water for an Americano-style dilution
Increases final volume without changing the extraction recipe.
—
Milk amount
Increase: add more milk if making a milk drink
Increases final volume and softens intensity.
—
Keep the extraction recipe unchanged — dilute after the fact rather than changing dose or grind, which would change the flavour balance you already have right.
When to reset: Note the dilution or milk amount you settle on as your new default beverage size.
Shots taste inconsistent from one to the next, or a single shot tastes both sour and bitter at once — a sign water is finding a fast path through part of the puck rather than passing evenly through all of it.
Try the first step below on its own, taste, then move to the next one only if needed.
Change
Try
Why
Watch for
FirstCleaning, prep or maintenance
Check / reset: level and distribute the grounds evenly before tamping
Even distribution is usually the single biggest factor in avoiding channelling.
—
Cleaning, prep or maintenance
Check / reset: tamp level, not to one side
An uneven tamp creates a low-resistance channel on one side of the puck.
—
Pre-infusion
Increase: use pre-infusion if the machine supports it
A gentler initial pressure ramp can reduce channelling on some pucks.
—
When to reset: Rebuild the puck (redistribute and re-tamp) before changing grind or ratio.
Each step links to its own page; this is the order they belong in.
One espresso, start to finish
You have the equipment and want the order of operations in one place.
Every step below has its own page with the detail; this is the sequence they belong in, which is the part nobody writes down. Most of it happens before the pump starts.
1Warm the machine properlyThe ready light reports the boiler, not the group. Leave the portafilter in.
2Know your waterIt is most of the drink, and it decides your descaling interval.
3Set the grindSmall steps. Espresso responds steeply.
Your shots are inconsistent and you cannot work out which variable is moving.
Espresso rewards changing one thing at a time. This path goes in the order the coffee itself travels — grinder, dose, distribution, tamp, extraction — so each step makes the next one readable.
1The grinderWhere consistency starts, and what to look for in one.
2Adjusting grind sizeWhich direction fixes which fault, and how big a step to take.
3Your basketPressurised or not — check this before troubleshooting anything.
