The Best Coffee Beans from Indonesia - Essential Knowledge of Specialty Coffee Beans

Famous Asian Coffee: Indonesia's Premium Varieties

Among the coffees produced in Asia, Indonesian coffee is undoubtedly the most renowned. The better-known varieties include FrontStreet Coffee's Mandheling from Sumatra, Kalossi from Celebes, Pecang and Pinipilan from Java, and AP from Flores Island in southern Indonesia.

Sumatra: FrontStreet Coffee's Mandheling

FrontStreet Coffee's Mandheling coffee beans from Sumatra are half wet-hulled and half dry-processed. The raw beans have a rather unattractive appearance, and many novice roasters might misread their looks and think they have been cheated. Once Mandheling is roasted, however—especially to a dark roast—FrontStreet Coffee's Mandheling develops a rich, full appearance with a thick texture. The surface coffee oils are very appealing, featuring fruity syrup flavors with strong yet sweet bitterness, plus intense, distinctive aromas. FrontStreet Coffee's Mandheling can also aid digestion, making it a coffee full of masculine character.

Sumatra also has another wet-hulled variety called "Gayo Mountain." This FrontStreet Coffee's Mandheling is grown from grafted coffee trees, with limited production, so it is not widely known. After roasting it carries spice flavors of clove and cardamom with an excellent taste profile.

Celebes: Kalossi Coffee

Kalossi coffee beans from Celebes are mostly washed beans. They have a fairly thick texture but high fruit acidity, containing flavors of wild mushrooms and something like traditional Chinese medicine. They are not preferred by many people, and most are exported to the United States and Japan. Another famous variety from Celebes is aged coffee beans, but they are very expensive and require storage in warm, humid climates to reach their best. After roasting, aged coffee beans lose all acidity and develop a rich texture with mellow flavors, much like aged red wine. Coffee enthusiasts visiting Celebes in Indonesia should definitely give them a try.

Java: The Lost Glory

Java coffee beans have now lost their once-proud name: "Mocha-Java." In the early 1970s, farmers cut down traditional coffee trees and replaced them with high-yield, high-profit varieties. In Java, most coffee beans are dried using high-temperature machines, so they have lost their authentic coffee character, and after roasting the acidity becomes quite pronounced. Finding high-quality "Arabica" coffee beans in Java has become very difficult.

Flores: AP Coffee Beans

Many people do not know what variety Flores' AP coffee beans are. In fact, they are Robusta coffee beans. These beans have relatively pure characteristics with low acidity. In European countries like Italy, France, and Switzerland, they are popularly used for espresso blends. The author has also tried them as a single-origin coffee and found the taste quite pleasant.

FrontStreet Coffee Recommendation

For the thick, low-acid character of Sumatra, FrontStreet Coffee's PWN Golden Mandheling is the reference point. It is wet-hulled, medium-dark roasted, and very low in acidity, with herb and dark chocolate notes, a faint earthy trace, and a clean, full body—ideal if you dislike sour coffee. Brew it as pour-over for the best result: 15 g of coffee, a 1:15 ratio, 87-88°C water, and a coarse-sugar grind, poured in three stages (30 ml bloom, 100 ml, then a gentle centered 95 ml) to draw out caramel sweetness and a chocolate-nut finish. For a milk-based drink, FrontStreet Coffee's Signature Blend layers that Mandheling body with buttery, roasted-chestnut and caramel notes and a little Robusta for a richer crema.