Watery espresso? Bitter crema? The cause is almost always the same. We show you how to consistently get good results with the portafilter.
A good espresso with the portafilter is no accident – it's the result of many small decisions. Grind size, tamper pressure, brew temperature, bean quantity: all of this contributes to the result. The good news: most problems can be traced back to five typical mistakes.
Mistake 1: The grind size is wrong
The most common case. If your espresso runs through in less than 20 seconds, it tastes thin and sour – the grind is too coarse. If it drips more than it flows, it's too fine, and you'll taste bitter notes. The goal is an extraction of 25–30 seconds for 18 g coffee to 36–40 g espresso.
Mistake 2: Uneven puck preparation
Channeling – uneven water paths through the coffee puck – ruins every recipe. Tap the portafilter gently on the work surface after grinding, distribute the ground coffee with a WDT tool (or a thin needle), and tamp straight, not at an angle.
Mistake 3: Wrong bean age
Too fresh roasted (under 7 days) and espresso is unstable – too much CO₂ in the puck leads to channeling. Too old (over 6 weeks) and the flavors are flat. The perfect window is between 10 and 30 days after roasting.
Mistake 4: The wrong bean
Not every bean is made for espresso. Light, acidic filter roasts perform poorly in the machine – they need higher extraction than espresso can provide. Choose espresso blends or darker single origins. Our KOKO BRASIL and KOKO SUPREME houseblend are designed for this.
Our recommendation
KOKO BRASIL – reliable espresso with rich crema
Chocolatey sweetness, muted acidity, stable crema. Perfect introduction to espresso craft and at the same time the all-rounder for everyday use – whether portafilter or fully automatic machine.
Mistake 5: Inconsistent water temperature
Without stable temperature, every shot will be a bit different. Give your machine at least 20 minutes to heat up after turning it on. With dual-boiler machines, a short purge before each shot is worthwhile to keep the brew group temperature stable.
The basic recipe for consistent shots
- 18 g beans in the portafilter
- 25–30 seconds brew time
- 36–40 g espresso in the cup
- Crema hazelnut brown, stable for 30+ seconds
If a parameter deviates, change only one variable at a time – otherwise you'll never figure out what actually made the improvement. With a few days of systematic dialling-in, you'll have a stable shot.