How Does the Processing Method Affect Flavour?

Massively. Washed produces clear, acidity-driven profiles. Natural brings sweetness, fruit, and body. Honey sits in between with pronounced sweetness. Processing is the third major flavour factor after variety and terroir.

Why that matters

Processing — the way the fruit flesh of the coffee cherry is separated from the seed — changes a coffee’s flavour so fundamentally that the same coffee from the same farm, harvested in the same year, can taste completely different depending on how it was processed. The reason: during processing, chemical reactions occur (fermentation, sugar migration, enzymatic breakdown) that shape the bean’s aromatic profile.

In washed processing, the fruit pulp is removed immediately. The bean ferments briefly in water, is washed, and dried. The result: the bean’s own aromas take centre stage — clear, transparent, with pronounced acidity and floral notes. You taste the terroir, not the process.

In natural processing, the entire cherry dries in the sun. Fruit sugars migrate into the bean over weeks while slow fermentation takes place. The result: more sweetness, more body, fruity to berry-like notes, sometimes winey or fermented aromas. The flavour reflects both the bean and the process.

Honey process sits exactly in between. Depending on mucilage percentage (White through Black Honey), the profile shifts toward washed or natural. Sweetness is almost always more pronounced than in washed, the body fuller, the acidity softer.

Newer experimental methods like anaerobic fermentation or co-fermentation with fruits and yeasts can produce even more intense profiles — from tropical fruits to cinnamon notes to wine-like character.

At Green Wall Coffee

At our café on Sophienstraße 27 in Berlin-Lichtenberg, we print the processing method on every coffee bag. At the counter, I often explain the difference with the simplest comparison there is: two coffees from Ethiopia, one washed, one natural. Same origin, same variety — and yet one tastes of jasmine and bergamot, the other of strawberry and mango. Once you’ve tried them side by side, you understand why the processing method is on the bag.

More depth on this topic in the article How to Make Perfect Espresso. Or stop by at Sophienstraße 27 — Mon–Fri 8am–5pm, Sat 10am–5pm.