Quick answer: Sumatran coffee comes from the Indonesian island of Sumatra and is known for a heavy body, low acidity and earthy, spicy, herbal flavors. Most of it is wet-hulled (giling basah), a local processing method that hulls the beans while they are still moist. It is usually sold as a dark roast, and Mandheling, Lintong and Gayo are its best-known names.
Sumatra is one of Indonesia’s main islands and home to Lake Toba, a huge volcanic lake whose highlands grow some of its best-known coffee. Here is how Sumatran coffee is processed, what it tastes like and how to brew it.
In this guide 8 sections
How is Sumatran coffee processed?
Most of Sumatran coffee’s distinct flavor comes from how it is processed after picking, along with the island’s climate and the plant varieties grown there.
Sumatran coffee is mostly wet-hulled, which is a coffee-growing method specific to certain parts of the world only. Wet hulling is known locally as ‘giling basah’, which is the most common coffee processing method in Sumatra.
Here is how wet hulling typically works:
- Smallholder farmers pulp the cherries soon after picking, often with small hand-built machines.
- The pulped beans, still in their sticky parchment, are held in sacks or tanks, where they ferment; in some areas they are then washed and briefly pre-dried.
- Farmers sell the coffee at high moisture to a collector, who moves it on to a mill.
- The mill strips off the parchment while the beans are still soft, at roughly 35–50% moisture.
- The bare green beans are then dried, often on tarps for one to two weeks, down to export moisture.
Not all Sumatran coffee is wet-hulled; some is fully washed or natural (dry) processed. Elsewhere, coffee is usually dried in its parchment to about 10–12% moisture before hulling. Hulling Sumatran beans while they are still wet is what sets the process apart (Cafe Imports explains the steps in detail).
Why do Sumatran farmers wet-hull coffee?
The main reason is the weather. Sumatra is humid and cloudy, with frequent rain during the harvest, so drying coffee fully in its parchment is slow and risks mold and over-fermentation.
Wet hulling also lets beans dry faster once the parchment is off, and lets smallholder farmers in remote areas sell partly dried coffee to collectors instead of drying it fully themselves.
Sumatran beans are much wetter than other coffees when they are hulled.
The beans actually take a beating during the whole process. That rough handling is part of what gives Sumatran coffee its earthy character.
While the Sumatran weather is perfect for coffee plantations to thrive, it poses a problem in the post-processing stages. One moment the sun shines brightly over the Sumatran island, and the next moment it rains heavily.
What does Sumatran coffee taste like?
The wet-hulling process and long drying give Sumatran coffee low acidity, a heavy body and an earthy aroma.
Sumatran coffee beans are an amazing blend of mossy, wild, spicy, and mushroomy tastes.
Common tasting notes include dark chocolate, nuts, herbs and spice, with a savory, earthy edge. Lots vary, so expect differences between farms, regions and roasters.
A good cup can also be creamy and sweet, with a hint of butterscotch.
If you are used to bright, fruity coffees, the dark and earthy taste of Sumatran coffee can take some getting used to.
Many roasters take Sumatran beans dark to bring out rich, sweet, caramel and butterscotch flavors.
Is Sumatran coffee a dark roast?
Sumatran coffee is often sold as a dark roast, but the origin of the coffee has nothing to do with the roast profile of the coffee.
The roast level is the roaster’s choice. Because buyers expect Sumatra to be dark and bold, most roasters take it dark, but medium-roast Sumatrans exist and show more of the herbal, fruity side.
Its heavy body also makes Sumatran coffee popular in blends and with large chains; Starbucks, for example, sells a dark-roast Sumatra.
See our Starbucks coffee guide for more on its roasts.
Mandheling, Lintong and Gayo: popular Sumatran coffees
The three best-known Sumatran coffee names are Mandheling, Lintong and Gayo. They are regions and trade names rather than plant varieties.
Mandheling is a trade name for coffee from North Sumatra, named after the Mandailing people. It is the most widely known Sumatran coffee.
Lintong beans are grown on a high plateau that overlooks Lake Toba. Like other Sumatran coffee beans, this variety also has a rich taste and aroma. The Gayo beans are grown in the northern Aceh region and are known for their intense flavor.
How should you brew Sumatran coffee?
Sumatran beans suit brew methods that play to their body.
Their strong, bold flavor works well for espresso, and a French press shows off their heavy body.
You can use an espresso machine, or if you don’t have one, you can also cold brew the coffee.
Cold brewing extracts slowly and gives a smooth, low-acid-tasting cup that suits Sumatra’s chocolatey, earthy notes.
Interesting facts about Sumatran coffee
- Indonesia is one of the world’s largest coffee producers, and Sumatra is one of its main growing islands.
- Sumatra grows both arabica (mainly in the northern highlands) and robusta.
- Most Sumatran coffee comes from smallholder farms using traditional methods, which is why wet hulling is still so common.
- Sumatra is also known for kopi luwak, coffee made from beans passed through the Asian palm civet, which is controversial because many civets are kept in cages.
- Arabica has been grown in Sumatra since the Dutch colonial era.
Want to compare? Try Sumatran coffee next to a bright Colombian coffee, or explore more single origin coffee and coffee beans from around the world.
Frequently asked questions
Is Sumatran coffee strong?
Sumatran coffee tastes strong because of its heavy body, low acidity and frequent dark roasts. Caffeine depends more on whether the beans are arabica or robusta than on the origin.
Is Sumatran coffee low in acid?
Sumatran coffee is known for low acidity, largely thanks to wet hulling and the dark roasts it is usually sold as. That makes it a common pick for people who find bright coffees too sharp.
What is wet-hulled coffee?
Wet-hulled (giling basah) coffee has its parchment removed while the beans are still at roughly 40% moisture, then it is dried further. The process gives Sumatran coffee its earthy, heavy-bodied character.
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