Semi-Washed

The semi-washed process, frequently referred to as wet-hulled or by its Indonesian name, Giling Basah, is a distinct method of post-harvest processing. Unlike the fully washed process, where the parchment is removed only after the beans are dried to a low moisture content, semi-washed coffee involves removing the parchment while the bean is still relatively wet.

What is semi-washed coffee? The process typically begins with the removal of the cherry skin using a depulper. The beans, still covered in sticky mucilage, are then partially dried for a short period. Before they reach the standard 11-12% moisture content, the parchment layer is mechanically removed. The naked, moist green beans are then dried further until they reach the final moisture target.

For those exploring coffee processing, the semi-washed method is famous for its impact on the cup profile. It is most commonly associated with Indonesian coffees, particularly from Sumatra and Sulawesi. The process often results in a heavy, syrupy body, lower perceived acidity, and earthy, spicy, or herbal flavor notes that are highly sought after by fans of traditional, bold coffee profiles.

In practice, the semi-washed method requires careful management. Because the beans are exposed to the environment without the protection of the parchment layer while still moist, they are more susceptible to mold and microbial activity. However, when executed correctly, it produces a unique sensory experience that cannot be replicated by other processing methods. It is a testament to the diversity of coffee processing and the influence of regional traditions on the final cup.