Specialty coffee · Worth knowing

All coffee undergoes fermentation, but the distinction lies in where, how long, and how controlled that process is. Washed processing uses short, controlled fermentation in water tanks to remove mucilage, producing transparent, terroir-driven cups with clean acidity and light body, though it requires up to 200 litres of water per kilogram. Honey processing, developed in Costa Rica, leaves varying amounts of mucilage on the bean during drying, positioning itself between washed and natural with added sweetness and body. Natural processing ferments the whole cherry for three to six weeks, creating fruit-forward and complex cups with dense body, though quality depends entirely on drying care. Anaerobic processing, the newest method, seals cherries in oxygen-free tanks to engineer fermentation precisely, boosting fruity esters by 300-400% compared to washed methods and producing intensely aromatic, reproducible results. Processing choices reflect both flavour goals and practical considerations: water access, labour costs, drying infrastructure, and market positioning.