What Does Golden Mandheling Coffee Taste Like?

Sumatra Mandheling is arabica grown in Indonesia's Aceh region and around Lake Toba and Lake Tawar near Medan. The name is not a producing region at all: it comes from the Mandailing people of northwestern Sumatra, a term that spread after World War II. The cup is full-bodied and low in acidity, with spicy and herbal notes.

What sets Mandheling apart is wet-hulling, a process in which the parchment is removed while the beans are still moist. Golden Mandheling, a wet-hulled lot, shows the same earthy, cedar-like depth. KONO dripper brewing, with a medium grind and steady pouring, keeps that heavy body intact rather than flattening it.

Sumatra Mandheling coffee from Indonesia is one of the representatives of Asian coffee, and the Aceh producing region along with Lake Toba and Lake Tawar around Medan are its core areas. This article starts from the origin of the name Mandheling, Indonesia's coffee-growing environment, and the differences between producing regions such as the Gayo Mountains in Aceh and Lintong, then takes a deep dive into how Sumatra's unique wet-hulling process shapes a coffee flavor that is full-bodied, low in acidity, and carries spicy and herbal notes. It also includes the flavor characteristics of Front Street Lintong Mandheling and Golden Mandheling, along with KONO dripper brewing parameters, to give you a complete understanding of the taste of Aceh coffee and how to drink it.

In the Asian coffee landscape, Indonesian Mandheling holds a pivotal position. However, one point needs to be clarified first: Mandheling is not the official name of any producing region; it is actually a transliteration of the name of the Mandheling tribe in northwestern Sumatra. Legend has it that during World War II, when Japanese troops occupied Indonesia, a Japanese soldier drank an extremely aromatic cup of coffee in a café and asked the owner what kind of coffee it was. The owner mistakenly thought he was asking "Where are you from?" and blurted out "Mandailing." After the war ended, the soldier recalled the cup of coffee he had drunk in Indonesia and called it "Mandheling." Since then, people gradually came to refer to arabica beans produced in Sumatra collectively as Mandheling coffee.

The homeland of Mandheling coffee is the island of Sumatra in Indonesia. Indonesia is located in Southeast Asia and is the world's largest archipelagic country, with its capital at Jakarta, bordering Papua New Guinea, East Timor, and Malaysia. It is also one of the earliest regions besides Yemen to cultivate coffee.

At the end of the 17th century, the Dutch first brought arabica seedlings to Ceylon (present-day Sri Lanka) and Indonesia. They first transplanted arabica Typica to Jakarta on the island of Java. Because the local climate and soil conditions were very suitable, arabica quickly spread to Sumatra northwest of Java and to Sulawesi to the northeast. In 1877, a large-scale disaster swept through the Indonesian archipelago. Coffee leaf rust nearly destroyed all coffee trees, and people had to abandon the arabica they had cultivated for many years and instead introduce more disease-resistant robusta coffee trees from Africa.

Today, Indonesia is a major coffee-producing country, with production mainly concentrated in Java, Sumatra, and Sulawesi, of which robusta accounts for 90% of total production. Sumatra Mandheling belongs to the arabica category, which has relatively lower output. When people mention Mandheling coffee today, they generally mean arabica beans produced on the Indonesian island of Sumatra.

Indonesia's Coffee-Growing Environment

Indonesia has a typical tropical rainforest climate, with an average annual temperature of 25 to 27°C, no distinction between the four seasons throughout the year, and annual rainfall of 1,600 to 2,200 millimeters. The country lies in a volcanic belt, and its soil is fertile and rich in minerals, which is very favorable for the growth of coffee beans. Indonesian coffee is grown at elevations between 900 and 2,100 meters, with the main growing areas concentrated at around 1,200 meters.

Indonesian coffee beans have two harvest seasons, with the main harvest roughly from September to October and the secondary harvest from May to June. This year, Indonesia's coffee bean exports have grown significantly compared with last year. Analysts believe that last year's high coffee prices in Indonesia led to reduced exports, while the recovery in production this season has driven exports up again. With one decrease and one increase, this year's export figures have shown a sharp climb.

Indonesia's main coffee-producing areas include the islands of Sumatra, Java, and Sulawesi, among which "Mandheling" from Sumatra is the most famous. In the area around Lake Tawar in the north, it can be called Aceh coffee or Lake Tawar coffee; the Lintong and Lake Toba areas can be called Mandheling. Sumatra is divided into eight provinces, but only two provinces grow coffee in large quantities—Aceh Province and North Sumatra Province. The most representative coffee-producing areas in these two provinces are the Gayo Mountains around Lake Tawar in Aceh Province, cultivated by the local indigenous Gayo people, and the coffee grown around Lake Toba in North Sumatra Province. Lake Toba is enormous and is the largest volcanic lake in the world. The Mandheling produced by Lake Tawar and Lake Toba are the famous "Two Lakes, Two Mandheling," and the Lintong producing area south of Lake Toba is equally renowned.

Lake Toba: Located north of Medan, the provincial capital of Sumatra, it is an alpine freshwater lake with an average elevation of about 900 meters. The lake is diamond-shaped, 100 kilometers long and 30 kilometers wide, with an area of 1,130 square kilometers. The surrounding highland lake area is at an elevation of about 1,100 to 1,600 meters, and it is also the largest volcanic lake in the world. What is commonly called Mandheling refers to Typica or its variants grown in the mountainous areas around Lake Toba, among which Lintong is the most famous Mandheling producing area in the Lake Toba region, also known as Lintong Mandheling coffee.

When making Lintong Mandheling from unselected green beans, the output can occasionally be unstable, but it also preserves to a large extent the flavor characteristics of Sumatra coffee—a strong, intense body with a distinctive spicy and herbal aroma. Therefore, Front Street also lists Lintong Mandheling in its high-value daily-drinking bean series, giving everyone a chance to taste the unique flavor of Indonesian coffee.

Aceh Gayo Mountain Producing Area:

The Gayo Mountain region is located in Aceh Province in northern Sumatra. Coffee is grown on the slopes around the town of Takegon and beside Lake Tawar, with cultivation elevations in the production area averaging between 1,110 and 1,600 meters. The coffee is grown by smallholders under shade trees and processed using the wet-hulling method, exhibiting unusual flavors and a deep yet lively full-bodied richness. Aceh, located at the northernmost corner of Sumatra, is a fascinating and complex place.

Due to long-term political instability, Aceh is not a region most people would visit. The Gayo Mountains are located in the Aceh producing area of North Sumatra Province, and most of those engaged in coffee cultivation there are local farmers. The word "Gayo" comes from a tribe in the Aceh region of Indonesia. This area has ideal growing conditions, a long history and culture, and unique flavors. Organic methods are widely used in coffee cultivation in this region, without chemical fertilizers, and it is considered a green coffee production area in the world. Therefore, Gayo coffee is also often called green coffee or Gayo organic coffee.

Lake Toba is located in the central part of North Sumatra Province. Dutch colonists moved "Java Mandheling" north to the Lake Toba area in 1888. Lintong in South Sumatra and the Lake Toba area can be called Mandheling, and the Lintong area is the actual Mandheling producing region. Mandheling comes from the mountainous areas around Lake Toba. This lake is located north of Medan, the provincial capital of Sumatra, and is an alpine freshwater lake with an average elevation of about 900 meters. What is commonly called Mandheling refers to Typica or its variants grown in the mountainous areas around Lake Toba.

Lake Tawar is located in the central part of the Aceh Special Region, at the northern tip of Sumatra. Most of what is produced in North Sumatra is Gayo, mainly the Ateng variety; the northern Lake Tawar area can be called Aceh coffee or Lake Tawar coffee, and its area is less than one-tenth that of Lake Toba. In recent years, however, its coffee quality and production have surpassed those of Lake Toba.

Because Indonesia has thousands of islands, not all coffee from the country tastes the same. In addition to Java, coffee beans produced on the Indonesian island of Sumatra are renowned worldwide for their heavy body, low acidity, and aromas of earth, spices, and herbs, which have made Mandheling coffee beans famous around the globe.

Indonesia's Unique Coffee Processing Method—Wet Hulling

Wet hulling, also known as Wet Hulling, is called Giling Basah in the local language and is a traditional Indonesian coffee processing method. Judging by the name alone, wet hulling seems very similar to wet processing (the washed method), yet the cupping flavors of these two processing methods are completely different. Coffee processed by wet hulling is usually full-bodied and intense, with a very distinct character.

The uniqueness of Mandheling coffee's flavor comes from the local distinctive post-harvest processing method for green coffee beans. Because Sumatra has rain year-round and high air humidity, if the natural sun-dried method were used, the coffee cherries might be ruined by rain or even excessive fermentation. Therefore, local conditions are not suitable for sun-dried processing.

In addition, the washed processing method requires an ample water source and sufficient funds, while local economic conditions are limited and cannot meet the requirements for fully washed processing. Thus, the wet-hulling method with distinct Sumatra characteristics emerged, requiring a short drying time and using less water in the process.

Wet-hulling method: After removing the skin and pulp of the coffee cherry, the parchment beans with sticky mucilage are briefly cleaned and then placed in a tank for a short fermentation. The longer the fermentation, the stronger the acidity. Some processing plants or estates even skip the fermentation step entirely and directly spread the parchment beans out evenly for drying. In this way, acidity is suppressed and the viscosity of the mouthfeel is increased. The parchment layer acts to a certain extent as a protective layer for the green coffee beans, protecting them from external damage.

However, Sumatra's local climate is too humid, and coffee drying takes longer. During this time, if the coffee remains at high humidity, it will attract bacterial infection and cause the coffee beans to be ruined. By removing the parchment layer and letting sunlight directly hit the surface of the green coffee beans, the green beans can dry quickly.

In the process of removing the parchment layer, greater friction is generated between the green coffee beans and between the green beans and the machine. Excessive heat may cause the coffee to age quickly, leading to the woody and earthy flavors peculiar to Sumatra coffee.

This special wet-hulling method causes Mandheling coffee beans to appear cracked and asymmetrical in shape, which is what we call "goat's feet." These are not defective beans; this is normal. Some friends even say that the uglier the Mandheling coffee beans, the better they taste.

Golden Mandheling Coffee

Another Mandheling coffee bean often mentioned is "Golden Mandheling," and the word "Golden" reflects the high quality of this coffee bean. Front Street selected Golden Mandheling produced by PWN. PWN uses extremely strict standards when producing Golden Mandheling: green coffee beans must be 18 mesh or larger, and there must be fewer than 3 defects per 300-gram green bean sample. On the basis of meeting G1 grade, it is further subjected to three rounds of manual hand sorting to ensure defective beans are completely removed, thereby extending cleanliness of the cup as much as possible and making the sweetness even stronger.

Traditional Mandheling coffee has a full-bodied mouthfeel because it is roasted to a darker degree. To present the traditional Mandheling flavor, Front Street uses a medium-dark roast when roasting Mandheling.

Front Street's Mandheling Coffee Brewing Parameters:

What makes the Kono dripper special is that its "ribs" extend all the way to the bottom of the outlet where the coffee liquid flows out. Because the ribs are at the bottom and are very short, they fit closely with the filter paper, so the flow rate is slower than that of the V60. Therefore, it can increase the coffee's extraction yield and enhance the coffee's body.

Dripper: KONO dripper, water temperature: 88°C, dose: 15 grams, coffee-to-water ratio: 1:15, grind size: medium-coarse grind (75% passing through a Chinese standard No. 20 sieve).

Use staged extraction. Bloom with water equal to twice the coffee dose, that is, 30 grams of water for 30 seconds. The reason a blooming stage is needed is to allow the coffee grounds to release internal carbon dioxide gas, thereby making the later stages of extraction more stable. Pour in a slow circular stream until 125 grams, then pause; continue pouring until 225 grams and stop. After the water in the dripper has dripped through, remove the dripper. Start timing from the beginning of pouring; the extraction time is 2'00". Next, pick up the whole cup of coffee and swirl it to mix evenly, then pour it into a cup for tasting.

[Front Street Lintong Mandheling Coffee Flavor Profile] Herbal, chocolate, caramel, overall relatively balanced.

[Front Street Golden Mandheling Coffee Flavor Profile] Nuts, spices, herbs, licorice, chocolate, caramel.

The above content is compiled by CoffeeHunters, a coffee news website.