Processing Methods
Anaerobic Fermentation
A controlled processing technique where coffee is fermented in sealed, oxygen-free containers to produce unique flavor compounds. Anaerobic fermentation yields intensely aromatic, often funky or boozy cup profiles.
In Depth
By removing oxygen, producers favor lactic acid bacteria over aerobic microbes, shifting the fermentation byproducts toward more complex esters and organic acids. Fermentation times range from 24 to 120+ hours at controlled temperatures, often monitored with pH meters. Anaerobic techniques have become a hallmark of competition-winning lots from Colombia, Costa Rica, and Ethiopia, though critics debate whether the technique masks or enhances inherent terroir.