Acidic
Vinegar
sharp acetic bite, balsamic
Acetic acid (the acid in vinegar) is naturally produced during cacao fermentation. In small amounts it contributes brightness and complexity. In excess it is considered a defect, producing an unpleasant sharp sourness. At its most refined, it can read as a balsamic richness rather than raw vinegar.
What Causes It
Acetic acid bacteria are essential players in proper cacao fermentation. They convert ethanol to acetic acid, which drives up acidity and helps the pulp break down. Poorly dried or under-processed beans can retain excess acetic acid, leading to prominent vinegar notes.
Where to Find It
Some unrefined bean-to-bar chocolate intentionally retains more acidity. Poorly processed commercial beans can show a sharp vinegar defect.