Double Fermentation Coffee

“Double fermentation” is a label, not a single recipe. Barista Magazine’s explainer notes the term is often applied to coffees soaked in water after fermenting and washing, a Kenyan practice that began as a way to hold washed coffee while drying space was scarce. It also describes a Guatemalan pre-fermentation, where cherries sit about 24 hours before depulping and then ferment in tanks for about 36 hours. Always ask which version a bag means.

The version that dominates specialty menus lately is double anaerobic: ferment whole cherries in a sealed, low-oxygen vessel, depulp, then ferment the beans again. Lee Dong Coffee’s Finca El Paraiso lot used 48 hours on whole cherry and 24 hours on pulped beans with Lactobacillus, and reviewers found mango, orange zest, and dark chocolate in a plush, syrupy cup.

The cups vary with the coffee underneath. Genesis Coffee Lab’s Ethiopian Sidamo read honeysuckle and lime zest, while Fumi Coffee’s Peru Yanesha Geisha leaned chocolaty with lavender and pink peppercorn. Three lots cannot show what the second ferment itself adds, since variety, altitude, and the producer’s control of time and temperature shape the cup as much as the extra step.