Anaerobic Coffee Processing: What It Means & Why It Matters

There’s a lot of lingo in coffee processing, and it can get confusing fast. If you’re a coffee lover looking to expand your knowledge, you may have come across the term anaerobic coffee or anaerobic processing. But what does it actually mean?

What Is Anaerobic Coffee Processing?

In simple terms, anaerobic coffee processing means fermenting coffee without oxygen at some point during its journey from cherry to bean. This unique fermentation process leads to bold, complex flavors that stand out from traditionally processed coffees.

Maybe you remember from science class that fermentation is a natural process where microbes break down sugars. All coffee undergoes fermentation, but the how makes all the difference. Coffee cherries (the small fruits that contain coffee beans) have a slimy mucilage layer packed with sugars. The microbes in the environment interact with these sugars, creating distinct flavors. Fun fact: this is why coffees from different regions taste unique—every place has its own microbial ecosystem!

How Does Anaerobic Fermentation Work?

The key factor in anaerobic fermentation is the absence of oxygen. Coffee is placed in a sealed environment—often a large tank—where fermentation occurs in a controlled setting. This method can enhance fruity, wine-like flavors and create a super unique coffee experience.

One producer mastering this technique is Carlos Pola, whose anaerobic coffee is one of our most unique and exciting on board. Carlos’s process involves placing freshly hand-picked cherries into sealed blue tanks and allowing them to ferment for 72 hours. During this time, CO2 is released through one-way valves, preventing oxygen from entering. After fermentation, the cherries are left intact and dried on raised beds in partial sun for 2-3 weeks—a method known as dry processing.

Why Try Anaerobic Coffee?

Anaerobic processing creates coffee with a flavor profile unlike any other. Expect bright, fruity, and complex notes that make each cup a unique tasting experience. If you’re a fan of experimental coffee, this is a must-try!

Get Your Hands on Anaerobic Coffee

Now that you know what anaerobic processing is, why not taste it for yourself? Grab a bag of Carlos Pola’s anaerobic coffee from Onda Origins and experience the difference! Shop now and elevate your coffee game.