Natural Process Coffee: Dry Fermentation and Flavor

Natural process coffee is not "unwashed" coffee, and it is not a shortcut. It is the oldest processing method there is and, done properly, the most demanding one — a fermentation that happens inside the whole cherry over several weeks and produces the most intense fruit flavors in specialty coffee.

Here is what actually happens inside the bean, why it is so easy to ruin, and what a well-made natural tastes like.

What natural process means

After picking, a coffee cherry can be handled three ways. Washed processing strips the fruit off within hours and dries the bare bean. Honey processing removes the skin but leaves the sticky mucilage on. Natural processing removes nothing: the whole cherry goes onto a drying bed intact, with skin, pulp and mucilage still attached, and stays there for two to five weeks.

The bean dries inside its own fruit. And while it dries, the fruit ferments against it.

Dry fermentation: what happens inside the cherry

This is the part that separates naturals from everything else.

The intact cherry skin acts as a barrier. Oxygen gets in slowly, and the sugars in the pulp ferment in a low-oxygen environment, driven by yeasts and bacteria that were already on the fruit. That is a different microbial population, and a different set of end products, from the fast submerged fermentation of a washed coffee.

Three things happen at once:

• Sugars migrate inward. As moisture leaves the bean, dissolved compounds from the pulp move across into the seed. This is why naturals taste sweeter even though no sugar was added.
• Fermentation produces esters. Yeasts convert sugars into alcohols and then into esters — the same class of compounds responsible for fruit aromas in wine. Strawberry, blueberry, rum and red wine notes come from here.
• Acidity drops relative to body. The malic and citric acidity that makes a washed coffee bright is partly consumed, leaving a rounder, heavier cup.

The process is slow on purpose. Moisture has to fall from roughly 60% to 11% through a layer of fruit, and rushing it produces uneven, defective lots.

Why it is so demanding

Natural processing has the highest failure rate of the three methods, and the reasons are all outside the producer's control:

• It needs consistent sun and low humidity for weeks. Rain during drying can ruin a lot outright.
• Cherries must be raked constantly. A cherry left face-down ferments unevenly and moulds. At our farm the beds are turned repeatedly through each day.
• The layer has to stay thin. Piled too deep, the cherries underneath overheat and over-ferment.
• Only fully ripe cherries work. An underripe cherry has too little sugar to ferment well and its defects cannot be hidden. Selective hand picking is not optional here.
• There is no correction step. A washed coffee can be re-washed. A natural that went too far is a loss.

The line between "intense and fruity" and "fermented and boozy" is thin, and it is crossed by a day of inattention. That risk is a large part of why naturals cost more.

What a well-made natural tastes like

• Fruit, clearly and immediately. Strawberry, blueberry, ripe plum. Not a subtle hint — the first thing you notice.
• Heavy body. Syrupy, coating, closer to the mouthfeel of a red wine than of tea.
• Sweetness without added sugar. Jam, dried fruit, molasses.
• Low, soft acidity that sits under the fruit rather than cutting through it.
• A long finish that keeps developing after you swallow.

What a badly made one tastes like: sharply alcoholic, vinegary, or like overripe fruit that has turned. If a natural tastes like nail polish remover, the fermentation went too far.

Natural vs washed vs honey

• Washed — fruit removed before drying. Clean, bright, most transparent to origin and altitude.
• Honey — mucilage left on. Sweeter and rounder than washed, less intense than natural. The middle ground.
• Natural — whole cherry dried. Fruitiest, heaviest, most distinctive.

None is better. They answer different questions. The full comparison is in natural vs washed vs honey coffee.

How to brew a natural

Naturals reward methods that preserve body and punish methods that strip it.

• French press — the best match. Full immersion and a metal filter keep the oils and the weight. See how to use a French press.
• Chemex or V60 — strips some body, but separates the fruit notes so you can identify them individually. Worth doing at least once.
• Cold brew — naturals make exceptional cold brew, because low acidity and fruit sweetness are exactly what the method emphasizes.
• Espresso — intense and polarizing. Pull it slightly longer than you would a washed coffee.

Practical notes: grind slightly coarser than you would for a washed lot of the same roast, brew a few degrees cooler — around 195 °F (90 °C) — and drink it black at least once before deciding what you think of it.

Our natural lot

Natural, $19.99 for an 8.5 oz (240 g) bag, whole bean or ground.

The cherries are grown at Hacienda Las Mercedes in Ciudad Bolívar, Antioquia, at 5,740 to 6,400 ft (1,750–1,950 m), picked by hand across six selective passes, and dried whole on the farm. Processing, drying, hulling and roasting all happen on site, which means the people watching the drying beds are the same people who will roast the result.

Orders are roasted after they are placed and ship within 48 hours. Shipping is calculated at checkout.

Frequently asked questions

Is natural coffee fermented?

Yes, and so is every other coffee. All three methods involve fermentation; what changes is where it happens and how long it lasts. In a natural, it happens inside the intact cherry over weeks rather than in a tank over hours.

Is natural process coffee stronger?

Not in caffeine — processing does not change caffeine content meaningfully. It tastes stronger because the body is heavier and the flavors are more intense.

Why is natural coffee more expensive?

Longer drying time, constant labor to turn the beds, more space occupied for weeks, a higher rate of lost lots, and a requirement for fully ripe cherries only. The premium is largely a risk premium.

Does natural coffee have less acidity?

Generally yes. Part of the acidity is consumed during the long fermentation, and the heavier body masks what remains. People who find bright coffees sharp often prefer naturals.

Is natural coffee the same as dry process?

Yes. Dry process, natural process and unwashed all describe the same method. "Natural" is the term the specialty industry settled on.

Taste one

See our six lots — washed, honey and natural from the same trees, which is the clearest way to understand what processing actually does.