Sumatra coffee is grown on the slopes of volcanic mountains in Indonesia and processed using a method called wet-hulling (giling basah) that exists nowhere else in the world. This unique process is the primary reason Sumatra coffee tastes the way it does , heavy body, low acidity, earthy and herbal flavors, dark chocolate, and sometimes tobacco or cedar. This guide covers the 3 key Sumatra coffee regions, the wet-hulling process, and how to brew this distinctive origin at home.