How does roasting change cocoa beans?

Roasting is a critical stage in cocoa processing that transforms the beans in several key ways:

• Flavor and Color: It develops the characteristic flavor of the beans while deepening their color.12
• Chemical Profile: The process reduces the acidity and astringency of the cocoa.12
• Physical Properties: Roasting lowers the moisture content of the beans and makes it significantly easier to remove the outer shells during the subsequent winnowing process.132

Once the shells are removed, the remaining nibs are ground to release cocoa butter, resulting in chocolate liquor, which serves as the foundation for various chocolate products. While some processes involve alkalizing (or "Dutching") the beans to further modify flavor and color, roasting remains essential for achieving the desired sensory qualities of the final product.132