Coffee processing methods

Before coffee reaches your grinder, machine, or cup, it begins life as something unexpected: a fruit. Coffee grows as a cherry, usually red or yellow, which must be carefully processed before the seeds inside are ready for roasting. This step, known as ‘coffee processing’, is one of the most influential stages in coffee production. It plays a major role in determining flavour, aroma, body, and overall cup quality. Understanding how coffee is processed helps cafés make more informed buying decisions and better communicate flavour stories to customers. Let’s take a look at the most common coffee processing methods used today, as well as newer experimental techniques shaping the future of specialty coffee.

What is coffee processing?

Coffee processing refers to the method used to remove the fruit from the coffee cherry and prepare the seeds (green coffee) for roasting. Different processing methods change how sugars, acids, and compounds interact during drying and fermentation, which is why the same coffee variety can taste wildly different depending on how it’s processed.

The three most common methods you’ll see on menus are:

  • Washed (Wet)
  • Natural (Dry)
  • Honey (Pulped Natural)

The washed, wet process

The washed process is the most widely used coffee processing method globally and is known for producing clean, transparent flavour profiles. Beginning with depulping, where freshly harvested cherries are mechanically depulped, removing the skin while leaving a thin layer of fruit (mucilage) on the seed.  Then fermentation, when the seeds are soaked in clean water for 48 – 72 hours. Naturally occurring microorganisms break down the remaining mucilage.

Washing & Sorting after fermentation, beans are washed to remove residue and often graded by density and size. Followed by drying, where beans are sun-dried on patios or raised beds until they reach 10–12% moisture. Milling & Resting after drying, when the parchment layer is removed, and the coffee rests in storage to stabilise before export and roasting. A Typical flavour profile is clean, bright, and clear with pronounced acidity and a lighter body.

The natural, dry process

The natural process is one of the oldest processing methods and remains common in regions with limited access to water. By drying the whole cherry, fresh cherries are laid out on patios or raised beds and dried intact. Then cherries are turned frequently to prevent mould and ensure even drying. Followed by hulling; once dried, the shrivelled fruit layer is mechanically removed. Beans are then stored to rest and stabilise before roasting. A typical flavour profile is full-bodied, fruit-forward, and sweet, often with berry or tropical notes.

Honey, pulped natural process 

The honey process sits between washed and natural processing and is named after the sticky texture of the mucilage left on the seed. Starting with depulping where the cherry skin is removed, but some or all of the mucilage remains. Then drying with mucilage intact, beans are sun-dried without washing or fermentation tanks. Followed by frequent turning to prevent fermentation issues due to the sticky surface. Milling & Resting comes next, once dry, the remaining layers are removed and the coffee rests. A typical flavour profile is balanced sweetness, moderate acidity, and a round body, often combining clarity with fruit character.

Why do producers choose different methods?

Processing choices are influenced by access to clean water, climate and drying conditions, equipment and infrastructure, market demand and price premiums. In many regions, farmers sell cherries to cooperatives that manage processing centrally. This shared infrastructure helps improve quality, consistency, and economic viability for producers.

New and experimental coffee processing methods

As demand for high-end specialty coffee grows, producers are experimenting with advanced techniques to unlock new flavour possibilities.

Anaerobic Fermentation

This method introduces fermentation in an oxygen-free environment. Cherries or depulped beans are sealed in tanks. Carbon dioxide displaces oxygen and fermentation lasts from 24 hours to several days or longer. The results are enhanced sweetness, intense fruit flavours, and sometimes boozy or funky notes.

Lactic Fermentation

Lactic fermentation encourages lactic acid bacteria rather than yeast. With oxygen-free conditions, controlled environments favour lactic acid production. Resulting in creamy texture and layered complexity. A silky body, yogurt-like acidity, and floral or tropical notes.

Carbonic Maceration

Adapted from winemaking, this method uses pressurised tanks filled with carbon dioxide. Highly controlled fermentation and precise temperature, pH, and timing control. Resulting in distinct, highly expressive flavour profiles not achievable through traditional methods.

Thermoshock, Thermal Shock

Thermoshock involves rapid temperature changes during processing. Coffee is exposed to extreme hot and cold water baths which alters cellular structure in the bean. Often paired with fermentation techniques. Resulting in increased sweetness, heavier body, and intensified aromatics.

Why coffee processing matters for cafés

For cafés, understanding processing helps to choose coffees that suit your menu and customer base. Plus, communicate flavour stories clearly and educate staff and customers with confidence. Processing isn’t just a technical step, it’s a major driver of flavour, quality, and identity in the cup. If you would like assistance choosing the perfect coffee blend for your cafe, reach out to the Zando team on  1300 926 362.

This information was sourced from our friends at Zest Coffee.