What Gives Sumatra Mandheling Its Earthy, Herbal Flavor?

Mandheling is the signature coffee of Indonesia, grown mainly on Sumatra and known for a heavy body with herbal and dark chocolate notes. The name comes from the Mandailing people rather than a place or variety, and PWN applies strict screening before selling lots under its Golden Mandheling mark. The wet-hulling process, done while the parchment is still damp, is what shapes the earthy, low-acid profile.

Indonesia's coffee history starts in 1699, when the Dutch East India Company brought Arabica trees and planted them around Batavia before expanding to Java, Sulawesi, Flores and Bali. Sumatra Mandheling is poured over a Kono dripper at parameters Front Street sets for a full, sweet cup. Java robusta coffee from the same country tastes quite different.

When it comes to Asian coffee, Indonesia is an important producing country that cannot be overlooked, and Mandheling is the signature of Indonesian coffee. It has a heavy body, with distinct herbal and dark chocolate notes, and is deeply favored by dark roast lovers and seasoned coffee enthusiasts. This article follows Front Street Coffee, starting from the historical origins of Indonesian coffee, and sorts out the characteristics of major producing regions such as Sumatra, Java, Sulawesi, Flores, and Bali one by one, with a focus on explaining the origin of the name Mandheling, the strict screening standards of PWN Golden Mandheling, and how the wet-hulling process shapes its unique earthy and dark chocolate flavors. Finally, it includes Front Street's Kono dripper pour-over parameters and extraction steps, taking you through a complete understanding of this classic cup of coffee from Sumatra.

For more specialty coffee knowledge, please follow the WeChat official account: Front Street Coffee (FrontStreet Coffee)

There are many coffee-producing countries in the world, and within Asia there is also a renowned origin, namely Indonesia. Almost anyone who knows something about coffee has likely heard of the name Mandheling. As a representative variety of Indonesian coffee, Mandheling is known for its rich and intense taste, with herbal and dark chocolate flavors standing out prominently. It is the preferred choice for many veteran coffee drinkers and those who favor dark roasts. Next, let's join Front Street Coffee (FrontStreet Coffee) to gain a comprehensive understanding of Indonesian coffee.

The Historical Thread of Indonesian Coffee

In 1699, while Indonesia was still under Dutch colonial rule, the Dutch East India Company (VOC, Vereeniging Oust-Indies Company) introduced Arabica coffee trees here, aiming to break Arabia's monopoly in the world coffee trade. The Dutch colonial government initially planted coffee around Batavia (present-day Jakarta).

After that, more coffee plantations were gradually established in East Java, Central Java, West Java, and parts of Sumatra and Sulawesi. Indonesia thus became the first place outside Arabia and Ethiopia to cultivate coffee on a large scale. Between 1725 and 1780, the VOC successfully achieved a monopoly on the coffee trade.

By the mid-17th century, the East India Company further expanded Arabica coffee cultivation to Sumatra, Bali, Sulawesi, and Timor. Coffee cultivation on Sulawesi Island can be traced back as early as 1750. In the highlands of North Sumatra, coffee first appeared near Lake Toba in 1888, and later extended in 1924 to the Gayo Highlands (Aceh) near Lake Laut Tawar. In the late 18th century, Dutch colonists built large-scale coffee plantations on the Ijen Plateau in eastern Java.

In the 1920s, smallholder farmers across Indonesia began growing coffee as a cash crop. However, disaster struck in 1876 when coffee leaf rust swept across Indonesia, destroying most Typica varieties. In 1900, Robusta coffee (C. canephora var. robusta) was introduced to East Java as a replacement, especially in low-altitude areas where rust was particularly severe.

The plantations on Java Island were nationalized after independence and were revived in the 1950s with the help of new Arabica varieties. These varieties were also adopted by smallholder farmers through government and various development programs. Today, more than 90% of Indonesia's coffee is grown by smallholder farmers, with an average farm size of one hectare or less.

Indonesia's Main Coffee Producing Regions

Sumatra Sumatra is both the largest island in Indonesia and the sixth largest island in the world, located in the northwest of Indonesia. Thanks to this geographical location, Sumatra has the earliest harvest season in the country, from November to March of the following year.

Mandheling coffee beans are precisely the Arabica coffee beans grown on the island of Sumatra. Sumatra coffee has low acidity and complex flavor layers, and many coffee lovers regard it as a typical representative of spice and herbal flavors.

Front Street believes that the taste of Sumatra coffee is influenced by multiple factors. On the one hand, the island's fertile volcanic soil gives the coffee an earthy aroma. As for its low acidity, the most critical factor lies in the processing method of Sumatra coffee, namely the wet-hulling method commonly used locally. This special processing method will be explained in detail below.

On the island of Sumatra, specialty Mandheling coffee mainly comes from the Lake Toba Lintong region and the Gayo Mountain region of Aceh. The two Indonesian coffees currently offered by Front Street Coffee (FrontStreet Coffee) both come from the producing areas of specialty Mandheling coffee. "Front Street Coffee (FrontStreet Coffee) — Everyday Series Lintong Mandheling Coffee Beans" shows flavors of baked toast, nuts, caramel, pine, and herbs; "Front Street Coffee (FrontStreet Coffee) — Front Street PWN Golden Mandheling Coffee Beans " shows deeper flavors such as spices, nuts, pine, caramel, herbs, dark chocolate, and so on.

Java

If you love coffee deeply enough, you must know that Java is synonymous with coffee. But what you may not know is that Java is an island in Indonesia, and some of the best coffee in the world comes from there. In the 17th century, the Dutch East India Company brought Arabica coffee plants to Indonesia. Most of Java's coffee is grown on five government-owned estates: Blawan, Tugosari, Pancoer, Jampit, and Kayumas. Java coffee is wet-processed, making the coffee cleaner and fuller-bodied rather than earthy like Sumatra. Java coffee is also known for its low acidity and rich flavors of molasses, clove, and fig.

Sulawesi

Sulawesi was formerly called Celebes and has six different provinces. One of these provinces, South Sulawesi, is where most of Sulawesi's coffee is grown, especially on smallholder farms in the Toraja highlands. Compared with other Indonesian coffees, Sulawesi coffee tastes lighter. Through cupping comparisons, Front Street Coffee (FrontStreet Coffee) found that specialty coffee beans produced in Sulawesi Toraja have bright acidity, distinct layering, and a rich caramel sweetness, while the rich herbal and spicy flavors are much more restrained, with a slight floral note.

Flores

Compared with other Indonesian islands, Flores is relatively small, spanning 200 miles from end to end. The island is known for its rich vegetation and is one of the few places where the endangered Komodo dragon can be seen. Most of the coffee is produced in the town of Bajawa at an altitude of 1,200 to 1,800 meters. Flores has rugged terrain and several active and inactive volcanoes. The ash from volcanic eruptions has created fertile ridge soils that are very suitable for producing organic coffee.

Bali

Bali is famous for its beautiful beaches, coral reefs, and yoga and meditation retreats. This tropical paradise offers some of the best coffee that Indonesia and even the world has to offer. Most of the coffee grows in the Kintamani highlands between the Batukaru and Agung volcanoes.

The Origin of Mandheling Coffee

Most coffee beans on the market today are named after the growing region or country, but Mandheling coffee is different. It is named after the Mandheling people who traditionally grew and processed the coffee beans. Why is that?

The story takes place during World War II, when a Japanese soldier stationed in Sumatra asked a local Sumatran where his coffee came from. The Sumatran man mistakenly thought he was being asked about his own ethnicity and replied: Mandheling. After the war, when the Japanese soldier returned home, he remembered that the coffee with the particularly special taste seemed to be called "Mandheling." In 1968, Nomura Trading Company of Osaka, Japan, visited the Indonesian company N.V. Pawani Medan and imported 15,000 kilograms of Sumatra Mandheling coffee. After being launched on the Japanese market, it became very popular. From then on, Mandheling coffee and the name of Pwani Coffee Company became widely known.

PWN is a well-known local green bean purchasing company in Indonesia. They subject wet-hulled Mandheling green beans to one mechanical sorting plus three rounds of hand sorting to ensure that the produced lots reach Indonesia's highest grade, namely G1. The purpose of mechanical sorting is first to screen out beans that must be 18 mesh or above, and the subsequent multiple manual sortings are to remove irregular defective beans. Reducing the defect rate greatly improves the quality of Mandheling coffee.

In order to distinguish it from Mandheling coffee from the producing regions, PWN registered "Golden Mandheling" as a trademark. The Golden Mandheling coffee beans sold by Front Street Coffee (FrontStreet Coffee) all come from PWN. In Front Street's offline stores, you can see PWN's Golden Mandheling coffee bean certification certificate as well as coffee burlap sacks printed with the company logo.

Special Processing Method — Wet-Hulling Wet-hulling is also called wet shelling, and in the local language it is also known as giling basah. It is a traditional Indonesian coffee processing method. From the name alone, wet-hulling sounds similar to the wet process. But in fact, the coffee flavors produced by the two are completely different.

So how exactly does the wet-hulling method process coffee beans?

Remove the skin and pulp, keeping the parchment and mucilage

Ferment in a water tank

Wash off the mucilage

Dry in the sun with parchment for 2-3 days, until the moisture content reaches 20-24%

Remove the parchment

Dry the green beans until the moisture content is 12-13%

Ready for export

Front Street Coffee (FrontStreet Coffee)'s Golden Mandheling is a very typical representative of wet-hulling. Because the extremely fast wet-hulling process causes a relatively high defect rate in coffee beans, workers are arranged at the processing plant to hand-sort and remove defects. Generally there will be DP (second hand sorting) and TP (third hand sorting). After three rounds of hand sorting, the defect rate of Mandheling will drop significantly.

Apart from some minor differences, it is generally believed that wet-hulled coffee beans have earthy, smoky, and chocolate flavors, with acidity described as low, and a full body, but sometimes also considered dull. PWN's Golden Mandheling coffee beans, however, show a high-quality herbal aroma, very obvious caramel sweetness, and a steady and elegant entry. After swallowing, the mouth is filled with a rich sweetness, full body, and wild spice flavors.

Front Street Coffee (FrontStreet Coffee) Brewing Suggestions

Dripper: Kono dripper Water temperature: 88-89℃ Dose: 15 grams Coffee-to-water ratio: 1:15 Grind size: medium-coarse grind (70% passing rate with China No. 20 standard sieve)

*Reason for choosing the Kono dripper: The Kono dripper has few ribs and they are located at the lower end. The filter paper fits closely against the dripper, which can restrict airflow and lengthen the contact time between water and coffee grounds, allowing the coffee grounds to be fully extracted and enhancing the full-bodied mouthfeel.

Use 30 grams of water for a 30-second bloom, then pour in a small stream in circles until 125 grams for a stage break. When the water level is about to expose the coffee bed, continue pouring until 225 grams and stop pouring. Wait for all the poured water to pass through the coffee grounds, then remove the dripper to finish extraction. (Start timing at the beginning of the bloom.) The extraction time is 2'00"-2'00".

For more specialty coffee knowledge, please follow the WeChat official account: Front Street Coffee (FrontStreet Coffee)

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