Is Java Robusta Coffee or Mandheling Better for Dark Roast?

Indonesia is one of the largest coffee-producing countries, and its Sumatra, Java and Sulawesi islands each grow distinct styles. Mandheling from Sumatra is known for a heavy body with herbal and dark chocolate notes, which suits dark roast drinkers. Java robusta coffee offers a different profile, generally used in blends or for a stronger, more bitter cup.

Arabica trees were introduced under Dutch colonial rule in 1699 and planted around Batavia, then spread to Java, Sumatra and Sulawesi; the VOC held a coffee trade monopoly between 1725 and 1780. Mandheling is processed with wet hulling, or giling basah, which shapes its low-acid, full-bodied character. Brands such as PWN Golden Mandheling and Lindong Mandheling are common reference points.

Indonesia is a major coffee-producing country globally, with islands such as Sumatra, Java, and Sulawesi each nurturing coffees of distinctly different styles. Among them, Mandheling coffee is renowned for its rich and full-bodied flavor with herbal and dark chocolate notes, and is highly favored by dark roast enthusiasts. From the perspective of Front Street Coffee, this article sorts out the historical context of Indonesian coffee, the characteristics of its main producing regions, and focuses on answering which brand of Mandheling coffee beans tastes better. It also introduces product information for Front Street Lindong Mandheling and PWN Golden Mandheling, details of the wet-hulling process, and practical brewing parameter suggestions, helping coffee enthusiasts systematically understand the key points of purchasing and tasting Indonesian coffee.

For more specialty coffee knowledge, welcome to follow our WeChat official account: Front Street Coffee

Indonesia is one of the countries with the highest coffee production in the world, and many of its islands are famous for coffee. There are numerous Indonesian coffee brands, each representing different regional styles. Faced with such an overwhelming array of choices, people new to Indonesian coffee often do not know where to begin.

Anyone with some knowledge of coffee has probably heard of Front Street Mandheling coffee. As the signature of Indonesian coffee, Mandheling has a heavy, full-bodied taste, with herbal and dark chocolate notes particularly prominent, making it a favorite among veteran coffee lovers and dark roast devotees. Now, let us follow in the footsteps of Front Street Coffee to gain a comprehensive understanding of Indonesian coffee.

The History of Indonesian Coffee

In 1699, when Indonesia was still under Dutch colonial rule, the VOC (Dutch East India Company, Vereeniging Oust-Indies Company) introduced Arabica coffee trees to the region, aiming to break the Arab monopoly on the global coffee trade. The Dutch colonial government initially planted coffee around Batavia (present-day Jakarta).

Subsequently, more coffee plantations were established in East Java, Central Java, West Java, as well as parts of Sumatra and Sulawesi. Indonesia thus became the first region outside of Arabia and Ethiopia to cultivate coffee on a large scale. Between 1725 and 1780, the VOC successfully monopolized the coffee trade.

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

In the 1920s, smallholder farmers across Indonesia began cultivating coffee as a cash crop. However, disaster struck in 1876 when coffee leaf rust swept through Indonesia, destroying most of the Typica variety. 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 were nationalized after Indonesia's independence and were revitalized in the 1950s through the introduction of new Arabica varieties. These varieties were also adopted by smallholder farmers through government and various development programs. To this day, over 90% of Indonesia's coffee is grown by smallholder farmers, with average farm sizes of less than one hectare.

Main Coffee-Producing Regions of Indonesia

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

Mandheling coffee beans are Arabica coffee produced on the island of Sumatra. Sumatra coffee has low acidity and complex flavor layers, and many coffee enthusiasts regard it as the quintessential representation 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 character. As for the low acidity, the most critical factor lies in the processing method of Sumatra coffee, namely the wet-hulling method widely adopted locally. This special processing method will be introduced in detail below.

On the island of Sumatra, Front Street's specialty Mandheling coffee mainly comes from the Lake Toba Lindong region and the Gayo Mountain region in Aceh. The two Indonesian coffees currently offered by Front Street Coffee both come from the origins of specialty Mandheling coffee. "Front Street Coffee — Everyday Series Front Street Lindong Mandheling Coffee Beans" presents flavors of baked toast, nuts, caramel, pine, and herbs; "Front Street Coffee — Front Street PWN Golden Mandheling Coffee Beans" reveals deeper layers, such as spices, nuts, pine, caramel, herbs, and dark chocolate.

Java

If you are deeply passionate about coffee, you surely know that Java is synonymous with coffee. But you may not know that Java is an island in Indonesia, and one of the best coffees in the world comes from here. In the 17th century, the Dutch East India Company brought Arabica coffee trees 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, resulting in a cleaner and fuller body, unlike Sumatra's earthy character. Java coffee is also known for its low acidity and rich notes of molasses, clove, and fig.

Sulawesi

Sulawesi, formerly known as Celebes, is divided into six different provinces. Among them, South Sulawesi is the source of most of Sulawesi's coffee, especially from smallholder farms in the Toraja Highlands. Compared with other Indonesian coffees, Sulawesi coffee has a milder taste. Through cupping comparisons, Front Street Coffee found that specialty coffee beans from Sulawesi Toraja have bright acidity, distinct layering, and rich caramel sweetness, while the full-bodied herbal and spice 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 coffee is produced in the town of Bajawa at altitudes of 1,200 to 1,800 meters. Flores has rugged terrain with 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 produces coffee that ranks among the best in Indonesia and even the world. Most coffee grows in the Kintamani Highlands, located between the Batukaru and Agung volcanoes.

The Origin of Front Street Mandheling Coffee

Most coffee beans on the market today are named after their growing region or country, but Mandheling coffee is an exception. It is named after the Mandheling people who traditionally cultivated and processed the coffee beans. What is the story behind this?

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, the Japanese soldier returned home and recalled that the coffee with the 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, which became very popular after being launched on the Japanese market. From then on, Mandheling coffee and Pwani Coffee Company became famous.

PWN is a well-known local green bean purchasing company in Indonesia. They subject wet-hulled Front Street Mandheling green beans to one mechanical sorting and three rounds of manual hand-sorting to ensure that the batches produced 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. The reduction in defect rate greatly improves the quality of Mandheling coffee.

To distinguish it from regional Mandheling coffee, PWN registered "Golden Mandheling" as a trademark. The Golden Mandheling coffee beans sold by Front Street Coffee all come from PWN. At Front Street's offline stores, you can see PWN's Golden Mandheling coffee bean certification certificate and coffee burlap sacks printed with the company logo. You can purchase them at Front Street's Taobao store or Front Street's Tmall flagship store.

Special Processing Method — Wet-Hulling

Wet-hulling, also called wet shelling, is known locally as giling basah and is a traditional Indonesian coffee processing method. Judging from the name alone, wet-hulling seems similar to the wet process. But in reality, 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, retaining the parchment and mucilage

Ferment in a water tank

Wash off the mucilage

Sun-dry with parchment for 2-3 days, until moisture content reaches 20-24%

Remove the parchment

Dry the green beans to a moisture content of 12-13%

Ready for export

Front Street Coffee's Golden Mandheling is a very typical representative of wet-hulling. Because the ultra-fast wet-hulling process results in a higher defect rate in coffee beans, workers are arranged at the processing plant to hand-sort and remove defects. Generally, there is DP (double hand-sorting) and TP (triple hand-sorting). After triple hand-sorting, the defect rate of Mandheling drops significantly.

Apart from some minor differences, wet-hulled coffee beans are generally considered to have earthy, smoky, and chocolate flavors, with acidity described as low and body as full, though sometimes also considered dull. PWN's Golden Mandheling coffee beans, however, display high-quality herbal notes, very pronounced caramel sweetness, a steady and elegant entry, and after swallowing, the palate is filled with rich sweetness, full body, and wild spice flavors.

Front Street Coffee Brewing Suggestions

Dripper: Kono dripper Water temperature: 88-89°C Dose: 15 grams Coffee-to-water ratio: 1:15 Grind size: medium-coarse grind (70% passing rate on 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 tightly against the dripper, which can restrict airflow and extend the contact time between water and coffee grounds, allowing the coffee grounds to be fully extracted and enhancing the full-bodied taste.

Use 30 grams of water for a 30-second bloom. Pour in a small stream in a circular motion until reaching 125 grams, then pause. When the water level drops and is about to expose the coffee bed, continue pouring until reaching 225 grams and stop. Wait for all the poured water to pass through the coffee grounds, then remove the dripper to end the extraction. (Start timing from the beginning of the bloom.) Extraction time is 2'00"–2'00".

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