Coffee grows as a cherry. The bean you brew is the seed. Processing is everything that happens between picking the cherry and getting a dry green bean ready to ship — and it's the second-biggest flavor decision after origin. Two coffees from the same farm processed differently will taste like two coffees.
Washed
The cherry is pulped (skin and pulp removed mechanically), the bean is fermented in water tanks for 12–48 hours to break down the remaining mucilage, then washed clean and dried. The bean dries with no fruit attached.
What you taste: clean, articulate, transparent. Acidity sits front and center — citric, malic, sometimes phosphoric. Origin character (Kenya's blackcurrant, Ethiopia's florals, Colombia's red apple) shows clearly because nothing layers on top of it. The standard for specialty single-origin.
Natural (dry process)
The whole cherry — bean, pulp, skin — is laid out to dry in the sun for 2–4 weeks. The bean ferments inside the fruit as it dries. Once dry, the dried fruit is hulled away.
What you taste: heavy, fruity, often boozy. Strawberry, blueberry, red wine, sometimes rum. Acidity is softer and rounder. Body is heavier. The fruit is louder than the origin — a natural Ethiopia and a natural Brazil can taste closer to each other than a washed Ethiopia and a natural Ethiopia from the same farm.
When done well, naturals are gorgeous. When done poorly, they taste like compost or fermented socks. Quality variance is much higher than washed.
Honey
Pulped like washed, but the mucilage is left on the bean during drying instead of being washed off. The bean dries with a sticky honey-coloured layer attached.
Subdivisions by how much mucilage is left:
- White honey: most mucilage removed. Behaves close to washed.
- Yellow / golden honey: medium. Sweet, balanced, light fruit.
- Red honey: more mucilage left. Heavier, riper.
- Black honey: maximum mucilage, slow dry. Almost natural-leaning.
What you taste: somewhere between washed and natural. Honey-like sweetness (hence the name), softer acidity than washed, less wild fruit than natural. The middle path.
Anaerobic / experimental
A wave of newer processes — anaerobic fermentation, carbonic maceration, thermal shock, lactic processing, yeast-inoculated. The common thread: the cherry or bean is sealed in oxygen-free tanks, often with controlled temperature, and ferments for hours or days before drying.
What you taste: extremely loud. Tropical fruit, candy, cinnamon, jasmine, things that don't normally exist in coffee. Often divisive — clean and exciting at one end, soapy and one-dimensional at the other.
These coffees usually cost more, change fast year to year, and reward exploration. They also make poor calibration coffees because they don't taste like "regular" coffee.
How processing changes what you do
Processing changes the bean's behaviour in the brewer:
- Naturals and dense anaerobics often want a finer grind — they're harder to extract through.
- Washed coffees show pour technique faults more clearly; they're transparent, so mistakes are loud.
- Naturals tolerate higher temperatures without turning bitter; washed light roasts at 96 °C are usually fine, naturals at 96 °C can sometimes go boozy.
When a recipe says "1:16, 93 °C, V60", the assumption is usually washed. If you're brewing a natural with the same recipe and it tastes muddled, it's not the recipe — it's the processing asking for slight adjustments.
What's on the bag
Roasters list processing on the bag, sometimes in code. "Lavado" / "washed" / "fully washed" all mean the same. "Natural" / "dry process" / "sundried" all mean the same. Honey is often subdivided. Anaerobic, lactic, thermal — those names come straight from the producer.
If a bag doesn't say, it's probably washed. The good roasters always say.