Anaerobic Natural

What is an anaerobic natural coffee? It is a hybrid processing method that marries the traditional natural process—where the whole cherry is dried—with the modern, controlled anaerobic fermentation technique. By sealing the whole cherries in a tank without oxygen, producers can create a unique environment that intensifies the fruit-forward characteristics of the natural process while adding the complex, winey, and often 'funky' notes associated with anaerobic fermentation.

In practice, the process begins with the harvest of ripe cherries. Instead of being depulped, the cherries are placed directly into sealed tanks or barrels. A one-way valve is typically used to allow the carbon dioxide produced during fermentation to escape while preventing oxygen from entering. This creates an anaerobic environment where the microbes on the cherry skin and in the pulp work to break down the sugars in a controlled, oxygen-free setting.

This fermentation phase can last anywhere from a few days to several weeks, depending on the desired flavor profile. Once the fermentation is complete, the cherries are removed from the tanks and spread out on raised drying beds to dry in the sun. This drying phase is critical, as it must be managed carefully to ensure the cherries do not ferment further or develop mold. The result is a coffee that has been 'pre-fermented' in a controlled environment before the final drying stage.

Why does this matter to the coffee drinker? Anaerobic natural coffees are known for their extreme intensity and complexity. You can expect a heavy, syrupy body, deep sweetness, and vibrant, often exotic fruit notes like tropical fruit, fermented berries, or even rum and raisin. It is a profile that is very different from a standard washed or natural coffee, offering a bold and adventurous experience for the palate.

In practice, these coffees are often the result of significant experimentation at the farm level. They require specialized equipment and a deep understanding of the fermentation process. For the consumer, they represent the cutting edge of coffee processing, showcasing how producers are using science and technology to push the boundaries of flavor. If you enjoy coffees that are 'funky,' intense, and full of character, the anaerobic natural process is a must-explore.