Making espresso sounds straightforward: pressurised water through finely ground coffee. In practice, every small detail makes the difference between a balanced shot and a bitter mess you pour down the sink. This guide covers everything you need to pull a clean espresso at home, from the beans to the cup.
What you need before you start
Four things matter more than anything else. If one of them is off, the result in your cup will be off too.
The beans
Whole beans, roasted for espresso, used between 10 and 30 days after roasting. Before 10 days, the beans still release too much CO2, which disrupts extraction and gives you an unstable crema. After 60 days, the oils oxidise and the flavour goes flat. That freshness window is where everything happens.
A freshly roasted specialty coffee will give you results you'll never get from a bag that's been open for three months. That's the starting point.
The grinder
This is the most important tool in your setup, more than the machine itself. A burr grinder (flat or conical) produces a consistent grind. A blade grinder doesn't. And if the grind is uneven, water takes the path of least resistance instead of flowing through the coffee evenly. That's called channeling: the water cheats, and your espresso ends up under-extracted on one side and over-extracted on the other.
If you have to choose where to put your money: grinder first, machine second.
The espresso machine
To make a real espresso, you need a machine that can reach 9 bars of pressure. Not a moka pot, not a capsule machine. A proper espresso machine with a portafilter.
We work with the Gilda and the Olympia Express for high-end home use, and La Marzocco for pro or semi-pro setups. These are machines built to last and to extract with precision. It's a real investment (expect at least CHF 1,500 for a decent machine), but this is equipment you keep for years.
Water
Your espresso is 90% water. Water that's too hard will muffle the flavours. Water that's too soft (distilled, reverse osmosis) will make the coffee harsh and acidic. The sweet spot: filtered water, or a lightly mineralised spring water. If you want to go deeper, Maxwell Colonna-Dashwood's book Water for Coffee covers this in detail.
The espresso recipe, step by step
A good espresso relies on a consistent workflow. The goal is to get the same result every morning, not to rely on luck.
1. Dose the coffee
Use a scale (not a spoon). For a single espresso: 7 to 9 g of ground coffee. For a double: 18 g. Precision to the gram makes a real difference. If you eyeball it, you'll get a different result every time.
2. Grind
Fine grind, suited for espresso. The exact setting depends on your grinder, your coffee and your machine. This is the variable you'll adjust most often. If the shot runs too fast: grind finer. Too slow: go coarser. It's a constant back and forth.
3. Distribute the grounds (WDT)
Before tamping, stir the grounds in the portafilter with thin needles (a toothpick works too when starting out). This breaks up the clumps from the grinder and spreads the coffee evenly. The technique is called WDT (Weiss Distribution Technique). Takes 5 seconds and genuinely changes the result.
4. Tamp
One press, perfectly level, to push out the air and create a compact puck. No need to force it, 15 kg of pressure is enough. What matters is that the surface is perfectly flat. If you tamp at an angle, water will flow faster on one side.
5. Extract
Start the extraction and time it. The standard:
- Ratio 1:2: 18 g of coffee for 36 g of liquid in the cup (or 7-9 g for 14-18 g for a single)
- Time: 25 to 35 seconds
- Pressure: 9 bars (factory setting on most machines)
Weigh your output (not by volume, crema throws off the ml reading). If you land in that window and the taste is right: you've found your setting.
How to adjust your espresso
Your shot isn't perfect on the first try? That's normal. Here's how to fix it.
Too acidic, watery, not enough body: your coffee is under-extracted. Grind finer, or let the extraction run a bit longer.
Too bitter, dry, astringent: your coffee is over-extracted. Grind coarser, or shorten the time.
Flat taste, no aroma: check how fresh your coffee is. Beans roasted more than a month ago won't give you much, even with perfect technique.
Change one variable at a time. If you adjust the grind AND the dose at once, you won't know what improved (or worsened) the result.
The paper filter trick
This has become common among baristas in recent years: placing a small paper filter disc inside the portafilter.
At the bottom of the basket: a damp paper disc catches the micro-particles (the "fines") that normally clog the filter holes. The result: you can grind a notch finer and extract more flavour without bitterness.
On top of the grounds (puck screen): a steel or paper disc that distributes water more evenly over the coffee puck. It also protects the shower screen of your machine. Not essential, but a real difference in consistency.
Classic espresso, turbo shot, modern long: the variations
The 9-bar standard is the starting point. But there are other ways to extract an espresso, depending on what you're after in the cup.
| Classic espresso | Turbo shot | Modern long | |
|---|---|---|---|
| Pressure | 9 bars | 6 bars | 2 to 5 bars |
| Ratio | 1:2 | 1:3 | 1:5 to 1:10 |
| Time | 25 – 35 sec | 15 – 20 sec | 45 – 90 sec |
| Grind | Very fine | Medium-fine | Medium (filter-style) |
| In the cup | Body, texture, crema. Chocolate and hazelnut notes. | Aromatic clarity. Great for fruity coffees, light roasts. | Long drink, very clean. Flavours unfold like a filter brew. |
The classic is the most versatile. The turbo shot requires a machine with pressure control (or a flow mod). The modern long is for exploring terroir: a longer cup that highlights where the coffee comes from.
Start by getting the classic right. The rest will come when you feel like experimenting.
Mistakes that ruin your espresso
| Mistake | What you'll notice | How to fix it |
|---|---|---|
| Wet portafilter | Uneven extraction, water running along the edges | Wipe the portafilter dry before every dose |
| Tamping twice | Micro-cracks in the puck, channeling | One tamp, firm and level |
| Dirty machine | Rancid taste, burnt aftertaste | Flush the group after every shot, full clean once a week |
| No scale | Random results from day to day | Weigh the coffee in AND the liquid out |
| Stale coffee | No crema, flat taste | Use coffee roasted less than 30 days ago |
