What Makes Golden Mandheling Coffee Taste So Full-Bodied?

Golden Mandheling is an Indonesian coffee known for low acidity and a heavy body. The name is not a variety or a place but a wartime misunderstanding, while the beans themselves come from Sumatra, mainly Aceh and North Sumatra, where the wet-hulling process is what builds the thick, earthy cup drinkers associate with Mandheling.

Coffee reached Indonesia in 1696, introduced by Dutch colonizers to Java and later spread to Sumatra. After leaf rust devastated the crop, the government brought in disease-resistant varieties such as Robusta, and today Indonesia ranks second in production behind Brazil, with Robusta making up most of the output. Pour-over parameters can be tuned one variable at a time.

Mandheling is a representative of Indonesian specialty coffee, known for its low acidity and high body. This article starts with Front Street Mandheling, tracing the history of Indonesian coffee from Dutch colonial introduction to variety replacement after leaf rust, explaining the origin of the misunderstanding behind the name "Mandheling," and delving into the two major producing regions of Aceh and North Sumatra in Sumatra, introducing the terroir conditions of Lake Toba and Lake Tawar along with the characteristics of varieties such as Typica, Tim Tim, and Catimor. The article also explains in detail why the wet-hulling process creates Mandheling's full-bodied flavor, and shares the pour-over parameters for Front Street Golden Mandheling and Lintong Mandheling, KONO dripper usage techniques, and practical methods for single-parameter adjustment.

Front Street Mandheling As one of the representatives of full-bodied coffee, those who like it usually can't get enough of it, while those who don't turn up their noses at it. Below, Front Street will talk about this "highly individualized" coffee bean.

The Development of Indonesian Coffee

Indonesia has a long history of coffee cultivation. According to relevant records, Indonesia's coffee history dates back to 1696. Coffee was introduced by the Dutch colonizers to Java for cultivation, and later spread widely to Sumatra, where large-scale planting began. After nearly two hundred years, Indonesia's coffee industry was devastated by leaf rust, with large areas of coffee trees infected and withering, severely affecting production.

To resolve this industry predicament, the Indonesian government began introducing new varieties with stronger disease resistance from various places, including the highly disease-resistant Robusta. To this day, Indonesia's coffee production ranks second only to Brazil, with Robusta beans accounting for the largest share, while Arabica beans account for only one-tenth of the total. Front Street Mandheling coffee is the most representative, and can be said to serve as the face of Indonesian specialty coffee.

Front Street Mandheling Coffee Comes from Sumatra

The name of Front Street Mandheling coffee does not come from variety classification or a place of origin, but from a story of misunderstanding. It is said that during World War II, when Japan occupied Indonesia, a Japanese soldier went to a certain café and drank a cup of rich, full-bodied coffee. He then asked the shopkeeper for the name of the coffee beans, but the shopkeeper thought he was asking where he was from, and answered "Mandheling." After the defeat, upon returning to Japan, he wanted to drink that coffee again and asked local Indonesians to find it, but mispronounced it as "Mandheling." Since then, the name Mandheling has been used ever since.

In fact, Front Street Mandheling originates from Sumatra, Indonesia. Sumatra is located in western Indonesia and consists of eight provinces. The high-quality coffee-growing areas are all in the northern part of the island, namely Aceh Province (ACEH) at the northernmost tip and the adjacent North Sumatra Province (Sumatera Utara). Each of the two provinces has a relatively large lake: in Aceh Province it is Lake Tawar, and in North Sumatra Province it is Lake Toba. The important coffee-growing areas in the provinces are also centered around these two lakes.

Lake Toba is the largest volcanic lake in the world and also the largest freshwater lake in Indonesia. Its average annual temperature is around 22°C, with a tropical rainforest climate. The rainy and humid environment, combined with an altitude of about 1,400 meters, provides conditions very suitable for coffee tree growth. To the south of the lake is the well-known local Lintong producing region. The Front Street Indonesia Mandheling everyday beans on Front Street's bean list come from here.

The other lake, Lake Tawar, brings an altitude of over 1,500 meters to coffee cultivation in the Aceh producing region due to the surrounding Gayo Mountain. Because of political instability in Aceh Province at the time, armed conflicts occurred frequently, greatly affecting the development of the local coffee trade. In 2005, a major tsunami broke out centered on Aceh. Under this natural disaster, the civil war also came to an end, and Aceh's coffee industry gradually returned to the specialty coffee scene from then on.

Let's Talk About Mandheling Coffee Varieties

As mentioned earlier, Indonesia's coffee industry was affected by leaf rust in 1877, and almost all of the Typica variety originally widely planted locally became infected. The Indonesian government successively introduced multiple disease-resistant varieties including Robusta, such as Tim Tim, Catimor, and the Indian variety S795, which locals call Tim Tim, Ateng, and Jember.

Just like in our country, Typica is also the variety with the longest cultivation history in Indonesia. It was initially introduced from Java to the broader Sumatra for planting. After a long period of adaptation to the local terroir, it developed the unique low-acidity, full-bodied flavor with herbal spice notes of Sumatra Typica. At present, it is mainly distributed around Lake Toba and the Lintong producing region.

Tim Tim is a natural hybrid of Typica and Robusta, inheriting Robusta's high yield and disease resistance. Another variety, Ateng (Catimor), is a hybrid descendant of the Bourbon variant Caturra and Tim Tim. Because of its strong vitality, it can maintain high coffee yields, and is therefore favored by many local coffee farmers. In many countries, Catimor is often criticized by industry professionals due to flavor defects. Grown in Sumatra's unique flavor environment, Catimor instead performs better in cupping, rich in woody notes and a full-bodied mouthfeel.

The Lintong producing region, which has a certain reputation in the coffee trade, also switched to planting many new varieties in order to increase yield, making the local coffee quality less excellent than before. Meanwhile, the Lake Tawar producing region in Aceh Province has always insisted on cultivating the ancient Typica variety, maintaining relatively high coffee quality. Some large exporters, such as Pwani Coffee Company, have also invested more resources here.

The Front Street Golden Mandheling coffee beans procured by Front Street come from PWN Pwani Coffee Company. On the basis of Indonesia's green bean Grade G1, they undergo four rounds of hand sorting to ensure that the Mandheling coffee beans are uniform in color, shape, and size, and the resulting Mandheling coffee has a cleaner taste and brighter flavor. Front Street Golden Mandheling is the upgraded version of Mandheling coffee, and there is also another entry-level version of Front Street Mandheling, namely Front Street Lintong Mandheling coffee beans. Both coffees have a low-acidity, high-body mouthfeel, originating from the widely used local wet-hulling process.

Wet-Hulling Process

The difference between wet-hulling and the washed method is that after the coffee beans are fermented, the parchment layer is removed while they are still in a semi-dry, semi-wet state. This processing is based on the fact that under the local high-temperature, high-humidity air, it is impossible to maintain more than ten days of sun drying to dry the green beans as in coffee-producing countries like Brazil and Ethiopia, so this unique method was developed.

After the coffee cherries are depulped with a depulper, the mucilage layer still feels slippery to the touch. After a night of fermentation, the mucilage layer is more easily removed under flowing clean water, and at this point the surface of the parchment beans becomes rough. Then the green beans begin to dry. This step also "depends on the weather." If there are two consecutive sunny days, the coffee beans are sun-dried for two days, and the moisture content of the parchment beans is at 30–50%. At this point, a specially made hulling machine can be used, relying on friction to strip off the still relatively hard parchment layer. The force is quite strong, so we can see that the surface of the green beans appears slightly deformed. Finally, drying continues for another two days. Under sunlight, the coffee beans easily crack open, which are what we call "goat-foot beans." When the moisture content reaches 12%, they can be bagged and stored.

The wet-hulling process greatly shortens the time needed to process green beans, and is also widely used in rainy, humid Indonesia. Removing the parchment layer midway through drying makes the coffee's acidity lower, and after roasting it further highlights the coffee's full-bodied mouthfeel.

Brewing Front Street Mandheling Coffee

For a coffee with this type of rich, full-bodied flavor like Front Street Mandheling, Front Street believes pour-over black coffee is most suitable. In the preparation stage, Front Street recommends using freshly roasted coffee beans, as the flavor is easier to bring out. Every batch of coffee beans shipped by Front Street is freshly roasted within 5 days. When you open the bag, it is at its fullest flavor and suitable for brewing and drinking directly.

Here, Front Street uses the same parameters to brew the upgraded version and the entry-level version of Front Street Mandheling coffee respectively. Front Street Mandheling coffee uses a dark roast, and the beans have a loose texture and stronger water absorption, making over-extraction likely during the extraction stage. Therefore, Front Street will adjust the grind coarser, which can speed up the water flow and at the same time lower the water temperature to avoid extracting excessive bitterness.

The biggest characteristic of Front Street Mandheling coffee is its full body, so Front Street chooses the KONO dripper. The smooth curved surface of the upper part of the KONO dripper allows the filter paper to fit better, hindering steam from rising, while the guiding ribs in the lower part speed up the water flow. This extends the extraction time between water and coffee grounds, thereby increasing concentration and making the coffee's mouthfeel fuller. By the way, the KONO dripper is also suitable for brewing medium-dark roasted coffee beans such as Front Street Blue Mountain coffee and Front Street Brazil Queen's Estate.

Dripper: KONO dripper, water temperature: 87°C, dose: 15 g, coffee-to-water ratio: 1:15, grind size: medium-coarse grind (70% passing through China standard No. 20 sieve)

First wet the KONO dripper so that the filter paper fits the coffee dripper better. Pour out the water in the server and add 15 g of coffee grounds. After blooming with 30 g of water for 30 s, begin pouring in a small stream in circles around the center. Once it reaches 125 g, begin分段. Wait until the coffee bed drops to half the height of the dripper, then begin the second pour using the same method until 225 g. Once all dripping is complete, the dripper can be removed.

The Front Street everyday-bean Mandheling coffee tastes distinctly of nuts and chocolate, with prominent spice notes at medium temperature, low acidity, and a solid mouthfeel. Front Street Golden Mandheling coffee has aromas of dark chocolate and spices right on entry, with almost no acidity, clear and bright flavors, and a long-lasting sweet aftertaste.

Brewing Adjustments

When you are still a beginner at pour-over, you may have more or less trouble adjusting various parameters during brewing. Front Street recommends recording data during each brew and changing only a single parameter at a time. This makes horizontal comparison easier, and only then can you accurately identify where the problem lies.

For example, when we feel that the brewed Front Street Mandheling coffee tastes a bit sour, not strong enough, and low in body, then it may be under-extracted, caused by water temperature being too low or the grind being too coarse. Then first adjust the grind finer and compare using the same brewing method. If the acidity weakens and the concentration increases, that means the direction is right. After recording, adjust another parameter. In this way, each brew will help you understand this coffee bean better than the previous pot.

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