How Java Robusta Coffee and the Ateng Variety Shape PWN Golden Mandheling
PWN's Golden Mandheling is grown from the Ateng variety, which local Indonesian growers use for what is actually Catimor. The first coffee planted in Indonesia was Typica, brought to Java by the Dutch in the late seventeenth century, but coffee leaf rust broke out in 1869 and destroyed large areas of Typica across Asia, pushing growers toward more resistant plants.
The government then introduced Robusta from Africa, and to this day java robusta coffee remains Indonesia's main cultivated crop, alongside resistant Arabica hybrids such as Tim Tim, Bor Bor and the Catimor series Ateng. Sumatra's wet-hulling process shapes the resulting java flavor, giving Golden Mandheling the rich, full body dark-roast drinkers expect.
The Golden Mandheling produced by Indonesia's PWN company is a classic in the hearts of dark roast coffee lovers. Why has its variety changed from Typica to Ateng? What kind of regional flavor does Sumatra's unique wet-hulling process give it? This article starts from the history of Indonesian coffee cultivation, sorts out the brand origins of Golden Mandheling and PWN's strict selection standards, and includes Front Street Coffee's pour-over parameters and brewing steps. Whether you are a beginner just starting out or a veteran looking for a rich mouthfeel, you can find practical references here.
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The Golden Mandheling currently produced by PWN uses the Ateng variety. This is the term commonly used by local Indonesian growers, and it is actually Catimor. The earliest coffee variety planted in Indonesia was Typica, recognized for its outstanding flavor, brought to Java by the Dutch at the end of the seventeenth century and locally called Bergendal or Sidikalang. So why was Typica later replaced by Catimor?
The development of coffee cultivation in Indonesia
The origin of Indonesian coffee can be traced back to the late seventeenth century. After the Dutch captured Jakarta on Java, they made it the base of the Dutch East India Company in the East, and then introduced Typica seedlings from India in two batches for trial planting on Java. Before the 1870s, coffee-growing areas had been established one after another in Sumatra, Bali, Sulawesi, and Timor, and the planting range gradually expanded from Java to the whole of Indonesia. But the good times did not last long. In 1869, coffee leaf rust suddenly broke out and quickly spread to producing areas across Asia, causing large areas of Typica trees in Indonesia to wither.
To save the coffee plantations devastated by disease, the Indonesian government introduced the more disease-resistant Robusta variety from Africa and elsewhere. To this day, Robusta is still Indonesia's main cultivated variety. In order to further ensure plant survival rates and increase coffee yields, Indonesia continued to introduce various disease-resistant varieties from other countries. Among them, the Robusta and Arabica hybrids Tim Tim and Bor Bor, as well as the Catimor series Ateng, because of their good disease resistance, high yield, and adaptation to Sumatra's terroir, present a unique cedar and herbal aroma. Soon, Ateng and Tim Tim gradually replaced the original Typica and became the main varieties in Sumatra and other regions, accounting for 70% of Sumatra's total coffee.
Front Street Indonesia Lintong Mandheling Coffee Daily Bean is a blend of Tim Tim and Ateng, processed by Indonesia's common wet-hulling method, presenting a rich coffee bitterness and aroma with very slight acidity, carrying herbal and spice notes. It tastes full-bodied and solid, making it a coffee with very high recognizability.
Sumatra-style semi-washed method - wet hulling
Indonesia's year-round humidity is 70%–90%. If washed processing were used for coffee, the green beans would mold and spoil in the humid air before they were fully dried, so they developed a semi-washed method that greatly shortens processing time - wet hulling. The steps before wet hulling are the same as for the washed method. Indonesians first remove the pulp from the coffee fruit, ferment it in water for 3 hours, wash off the mucilage, then dry the parchment coffee green beans for a short time for 2-3 days. When the moisture content is 20-24% and the beans are half soft and half hard, the parchment is hulled off the beans, and drying continues until the coffee's moisture content reaches 13%, at which point it can be bagged.
However, because the hulling machine uses relatively strong friction, it tears open the parchment layer clinging tightly to the green beans. Through the stirring caused by friction, the green beans are also more likely to be crushed or bruised, especially at both ends, forming small gaps and creating shell beans. The "naked beans" with the parchment layer removed dry very quickly, and at the same time are directly exposed to a humid environment, where various fungi and bacteria grow. This gives Indonesian coffee its unique woody, spicy, and herbal notes, which is what we call "regional flavor."
Obviously, wet hulling shortens the coffee bean fermentation period, lowers acidity, increases body, and increases grassy and herbal flavors. The "naked beans" still absorb moisture from the hot and humid air, forming Sumatra's characteristic earthy, herbal, and cedar "muted aroma." After roasting, they carry even richer dark chocolate, caramel, and roasted nut aromas, and are deeply loved by Japanese people who favor dark-roasted coffee.
The story of Golden Mandheling coffee
During World War II, the flames of war spread from the European continent to Asia. At that time Indonesia was still a Dutch colony. Because the Netherlands declared war on Japan, Japanese troops invaded Indonesia in 1942 and landed on Sumatra in February of the same year. The Japanese, who had already developed the habit of drinking coffee, tasted wet-hulled Mandheling coffee in northern Sumatra and were captivated by its charm, becoming devoted fans of Mandheling ever since.
There is even a saying related to the Japanese about the origin of the name Mandheling coffee. It is said to have been named because of a pronunciation misunderstanding. During World War II, a Japanese soldier happened to drink a cup of rich and aromatic coffee in a local café. Amazed, he asked the shop owner the name of the coffee. Because of the language barrier, the owner mistakenly thought the soldier was asking about his place of origin, so he answered "Mandailing." After the war, this soldier commissioned an Indonesian middleman to ship 15 tons of the "Mandheling coffee" he remembered back to Japan, and it became hugely popular. It can be said that this middleman made Mandheling successful, and Mandheling also made him later become the founder of the famous Pwani Coffee Company (PWN).
PWN mainly purchases high-quality local batches of Mandheling green beans and produces only specialty-grade Mandheling. "Golden Mandheling" is its signature product. After the Japanese took a liking to Sumatra coffee at the time and bought it for a long time, they gradually discovered that the quality of local beans was often uneven. So they paid more attention to Mandheling production and began formulating strict standards and methods for screening defects, including values such as bean density, size, shape, and color. The Mandheling produced needed one mechanical sorting plus four manual hand-sortings to remove defects, ensuring that the Mandheling produced was complete, uniform, large, and translucent, while also reducing Mandheling's earthy and grassy off-flavors. It is said that under the sun it shone golden, which is why it was named "Golden Mandheling."
As the specialty Mandheling coffee market grew larger, PWN also realized the importance of trademarks and registered the English name "Golden Mandheling" as an exclusive trademark one step ahead of the Japanese. Therefore, only Golden Mandheling produced by PWN can be considered true "Golden Mandheling," while what the Japanese produce can only be renamed "Dingshang Mandheling." The Golden Mandheling that Front Street purchased is of course the genuine product from PWN. You can identify authentic Golden Mandheling by the green bean gunny sack bearing the PWN mark and a certificate of origin signed by PWN. Front Street displays these two identifiers in the Dongshankou store.
How to brew Golden Mandheling so it tastes good?
Some customers ask Front Street: which Mandheling is better to choose? If you are a coffee beginner who wants to first understand the flavors of different producing regions, Front Street suggests starting with our cost-effective Lintong Mandheling Daily Bean, so you can understand the flavor characteristics of several major producing regions and then choose the type you prefer. But if you are already a coffee veteran, then Front Street believes Front Street PWN Golden Mandheling Coffee is a good choice.
Mandheling presents a full roasted coffee aroma and a solid mouthfeel, and is suitable for brewing and extraction by various methods, such as pour-over, siphon, French press, AeroPress, moka pot... Front Street's favorite way is to enjoy the rich mouthfeel of Golden Mandheling coffee as black pour-over coffee.
When brewing coffee beans that express body, Front Street likes to use the KONO dripper for extraction. The KONO dripper has short ribs only in the lower middle part, while the upper half of the dripper is a smooth curved surface. In this way, when we rinse the dripper, it can fit tightly with the filter paper, and the coffee's degassing during extraction is restricted, so the hot water stays in the dripper longer, the coffee extraction yield increases, concentration rises accordingly, and the coffee tastes richer and fuller. The KONO dripper is also suitable for beans with rich flavor types such as Brazil Queen's Estate coffee.
Generally, Front Street uses 15g of coffee grounds. The choice of dose is usually based on the size specifications of the dripper design, and Front Street's dripper is suitable for a serving for 1-2 people, so it can be between 15-20g of grounds. Too much dose can easily affect extraction. As for the choice of coffee-to-water ratio, 1:15 is the most commonly used, and a ratio range of 1:13 to 1:17 is acceptable. Front Street believes everyone's taste is different. 1:13 may be too strong for some people, and 1:17 too weak, so we take the middle value of 1:15.
Brewing parameters: KONO dripper, 87°C water temperature, 1:15 coffee-to-water ratio, China No. 20 standard sieve sifted to 70% grind size, 15g coffee grounds, three-stage extraction.
First rinse the dripper so the filter paper fits tightly against it, then pour in the ground coffee and try to level the coffee bed. Pour 30g of hot water from the center to begin blooming for 30s. At this point you can see the dark-roasted Mandheling coffee form a high dome. Then begin evenly pouring the second stage until the liquid weight is 125g. When the coffee liquid drops to the halfway point, begin pouring the final 100g. Be careful to pour steadily with a small stream throughout to avoid uneven extraction. After all the coffee liquid has finished dripping, remove the dripper, swirl the coffee liquid in the server to mix, and begin tasting.
The brewing parameters mentioned by Front Street are all based on fresh coffee beans, so freshly roasted coffee is the primary condition here. The coffee beans shipped by Front Street are all freshly roasted within 5 days. When you receive the coffee from the courier, it is just within the best-tasting period. This is in the hope that every customer can drink the most complete flavor of good coffee.
The freshly brewed Front Street PWN Golden Mandheling coffee clearly has a solid mouthfeel, with richer notes of cedar, spice, dark chocolate, and roasted hazelnut, a clean finish, and a flavor that goes up another level, allowing you to feel the sweetness and aftertaste of caramel.
The above content is compiled by CoffeeHunters, a coffee news website.
