Giling Basah: The Way of Making Coffee You’ll Find Almost Nowhere Else

Most people in coffee can tell you about washed and natural processing. Far fewer can explain giling basah, and yet it’s behind one of the most distinctive flavours in the world.

Giling basah means wet hulling, and it’s almost entirely Indonesian. It’s a traditional practice on islands like Sumatra and Sulawesi. There have been occasional experiments with it elsewhere, in parts of Vietnam for example, but nowhere else has it become a tradition. The reason is the weather it came from. In the humid highlands of Aceh, North Sumatra and Sulawesi, the long slow drying that washed coffee needs is a constant fight against rain and moisture. So farmers adapted, and in doing so they invented something the rest of the coffee world never did.

Here’s how it works. After picking and pulping, the beans dry only briefly. Then they are hulled while still soft and full of moisture, at around 30 to 35% water content, when everywhere else in the world the standard is 11 or 12%. The bare green beans, now without their protective parchment layer, finish drying in the open air. They come out a dark bluish green that experienced buyers can spot straight away.

More to the point, they come out tasting like nowhere else. Wet hulling quiets the bright acidity you get in washed coffees from Latin America or Africa, and turns up everything else. The body becomes heavy and syrupy. The flavours go deep and earthy: dark chocolate, cedar, spice, tobacco, forest floor. Specialty coffee argued about this profile for years and has now come back around to it, because it gives you something washed coffee can’t. Weight, warmth and presence in the cup.

It also makes sense commercially. Wet hulled Sumatran coffee holds its character through milk, it stands up in an unfiltered serve like the BRUUK Method, and it gives guests something genuinely different, rather than the fourth citrus led washed coffee on the high street that week.

There’s a cultural point too. Giling basah wasn’t invented in a lab or a marketing meeting. Generations of smallholder farmers worked it out while solving a real problem in a real climate, and it became a signature. When you serve a wet hulled Gayo coffee you’re serving that ingenuity: a method that belongs to that place, that humidity, those hands.

Our Sumatran lots from the Gayo Highlands are wet hulled in the traditional way, and we roast them in the UK to keep that character rather than flatten it.

Some things can’t be copied. That’s rather the point.

Want to taste the difference wet hulling makes? Our Discovery Pack puts Gayo, Java and Flores side by side. You can also ask us about a cupping session for your team.

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