Ferment

Definition

A sour and oniony taste characteristic of over-fermented coffee. After de-pulping coffee cherries, which removes the skin and some attached mucilage (pulp), the separated beans will still have a significant amount of pulp attached. The remaining pulp is often loosened by fermentation, allowing it to be washed away prior to drying. If fermentation is not stopped as soon as the remaining parchment (husk) is no longer slimy, and has a rough texture, the coffee may acquire a ferment flavor.