What separates Aceh Gold from other famous coffees of Sumatra?

Aceh Gold is premium coffee from the Aceh region of Sumatra, and it breaks the usual Mandheling expectation. Tasting shows a clean cup with creamy chocolate sweetness and soft acidity instead of the herbal, smoky, heavy profile many drinkers associate with Sumatra. That contrast is the point of the sample bag that started this review.

The wider picture covers Indonesia's three main origins, Java, Sulawesi and Sumatra, and their terroir, varieties and processing. Grading standards and flavor differences run across Mandheling, golden mandheling coffee and Toraja, alongside wet hulling and its risks, green bean defect grading, and specialty lots such as Aged Mandheling, Tiger Mandheling and West Java honey-processed coffee.

While studying Mr. Han Huaizong's "The Craft of Specialty Coffee," Front Street Coffee received a complimentary bag of sample beans labeled "Sumatra Aceh Gold," which sparked an in-depth exploration of Indonesian specialty coffee. Aceh Gold refers to high-quality coffee produced in the Aceh region of Sumatra. It is completely different from the stereotypical Mandheling profile of rich, rugged, herbal, and smoky notes. Instead, it presents a clean character, creamy chocolate-like sweetness, and slight acidity, reminiscent of refined Central and South American coffees. This article will follow in Front Street's footsteps and systematically review the geography, terroir, variety characteristics, and processing methods of Indonesia's three major coffee-producing regions—Java, Sulawesi, and Sumatra. It will explain in detail the grading standards and flavor differences of famous coffees such as Mandheling, Golden Mandheling, and Toraja, and will also take a deep dive into the process and risks of wet hulling, the green bean defect grading system, and the distinctive qualities of specialty coffees such as Aged Mandheling, Tiger Mandheling, and West Java honey-processed coffee.

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In order to gain a more systematic understanding of theories related to specialty coffee, Front Street purchased "The Craft of Specialty Coffee" by Mr. Han Huaizong, and the book came with a complimentary bag of sample beans printed with "Sumatra Aceh Gold."

After reviewing the materials, I learned that Aceh Gold refers to premium coffee from the Aceh region of Sumatra. People usually associate Sumatra coffee with a bold, rough, "heavy" style that has obvious herbal notes. With a mindset of verification, Front Street tasted this Aceh Gold, and the result was surprising—it completely lacked the herbal and Chinese medicinal notes of Mandheling, and it also did not have a heavy smoky quality. Instead, it showed a very clean style, accompanied by full creamy chocolate sweetness, and even revealed a bit of soft acidity, making Front Street momentarily think it was drinking a delicate Latin American coffee.

By this point, you must already be full of curiosity about this mysterious origin, Aceh. Next, let Front Street take you into this world-famous archipelago nation and provide an in-depth understanding of all aspects of its local specialty coffee.

Indonesian Mandheling coffee is known for its rich, mellow caramel and herbal flavors, with a solid, full body on the palate and a long, sweet finish. In Front Street's view, it is a specialty coffee very much worth trying. Indonesia is an important coffee-producing country in Asia, and Mandheling is the country's most famous coffee. Indonesia has three major coffee-producing regions. What exactly are the differences among the coffees produced in each? Follow Front Street to find out!

Indonesia is made up of more than 17,000 islands, lying across the equatorial volcanic belt. The hot, humid tropical rainforest climate on both sides of the equator brings abundant rainfall, while fertile volcanic soil provides rich nutrients. Among the entire archipelago, the finest growing areas are concentrated on Java, Sumatra, and Sulawesi.

| Growing Regions:

Java: Java holds an important place in the history of coffee development. Unlike other Indonesian coffees, Java's Arabica coffee is not initially processed on small farms, but is grown on large farms or plantations, mostly managed by the government, and generally uses modern wet processing. The variety is S795, locally called Jember, and it is a cultivated variety.

Coffee from Java is known for its refined aroma, relatively low acidity, delicate mouthfeel, and good balance. Its aroma and acidity are superior to coffees from Sumatra and Sulawesi. Java's finest plantations include Blawan, Jambit, Kayumas, and Pankur, among others. Java Mocha coffee is a blend of Java coffee and Yemeni Mocha coffee.

Sulawesi: Sulawesi, formerly called Celebes, is the oldest island in the archipelago, with exposed rocks over a million years old. In the coffee-growing areas, yellow-red podzolic soils can be found, and beneath the surface of these soils there are often several layers of clay rich in iron. The best-known producing area is Toraja in the highlands of South Sulawesi.

Kalosi, south of Toraja, is the main city in the region. There are also two lesser-known areas: west of Mamasa and Gowa in southwestern Kalosi. The few wet-processed coffees are quite interesting and worth trying; it is strongly recommended to try them if you have the chance. Semi-washed processing is the method commonly used on Sulawesi, and the island also produces a good amount of Robusta beans. The island's name is often used to represent Sulawesi coffee, which is known for its full, syrupy body, rich flavors, and low, lively acidity.

Most Arabica beans are grown in the highlands around Tana Toraja, while Kalosi in the south has become a brand.

*Kalosi: A market name for coffee from southwestern Sulawesi, referring to the small town of Kalosi in the center of the island, which is a trading hub for Toraja coffee beans.

*Toraja: A growing area located in the highlands of southeastern Sulawesi, and also the name of the island's specialty beans. Toraja is not a place name, city name, or variety name, but refers to the Toraja people who live in the central mountains of Sulawesi and are skilled at growing coffee. Toraja is also a rare specialty coffee in the world, with an annual output of about 1,000 metric tons. It is distributed across rugged slopes at about 1,200 meters in central and southwestern Sulawesi. Planting and harvesting are both difficult, and the average annual yield is only 300 kilograms per hectare, far below the average level of more than 1,000 kilograms in Central and South America.

Toraja's three major estates are: "PT Kapal Api," which owns 2,000 hectares of coffee plantations; "CSR," which ranks second with 1,100 hectares; and "Toarco Jaya," under Japan's "Key Coffee," which is the third-largest estate with 700 hectares. In other words, Toraja is more precious and rarer than Mandheling or Golden Mandheling.

Toraja uses wet or semi-washed processing. Its acidity and aroma are brighter than Sumatra Mandheling or Golden Mandheling, and its layering is more pronounced. It has rich caramel sweetness, but its earthy, musty, dark-wood notes and body are much more restrained than Mandheling, and it also has a slight floral aroma.

Sumatra: Sumatra's finest coffees come from two places: the Central Aceh region of North Sumatra near Lake Tawar, and the more southerly area around the mountains surrounding Lake Toba. Because many smallholder producers use a unique semi-washed processing method, and because the soil is low in iron, coffee from this region shows a distinctive blue color at the fresh green bean stage.

*Mandheling: Refers to semi-sun-dried or sun-dried beans from the Lintong mountain area at 900–1,200 meters above sea level on the southwestern shore around Lake Toba in north-central Sumatra, and it is most famous there. The Batak people are the main body of coffee farmers in this area. Mandheling was once praised as the coffee bean with the fullest body in the world. Mandheling is a trademark used for Arabica coffee from North Sumatra. The name comes from the Mandailing people who produce coffee in the Tapanuli region of northwestern Sumatra, and it has a distinctive herbal and woody agarwood-like flavor.

*Lintong producing area: Lintong Mandheling is at 1,200 to 1,500 meters above sea level and comes from the Lake Toba area of North Sumatra. It is the island's most famous coffee. To correctly understand Golden Mandheling coffee, it is not the case that Mandheling that is golden in color is Golden Mandheling.

Golden Mandheling is produced in the Lintong area of northern Sumatra, Indonesia. Harvesting is limited to fully hand-picking only fully ripe cherries one by one to ensure initial bean selection quality. The coffee cherries are processed using the SEMI-WASHED method, naturally sun-dried, then dried and refined once more after hulling, followed by two rounds of green bean cleaning and four rounds of Hand-Pick manual sorting. Therefore, each one can be called a strictly selected top-grade Mandheling. The "PWN" mark is the abbreviation of the Indonesian company Pawani, and the Golden Mandheling produced by this company has been registered in Indonesia.

*Lake Toba: 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 Mandheling producing region. Mandheling is produced in the mountainous area around Lake Toba. The lake is located north of Medan, the provincial capital of Sumatra. It is an alpine freshwater lake with an average elevation of about 900 meters. What is commonly called Mandheling refers to Typica or its variant coffee beans grown in the mountains around Lake Toba. The lake is diamond-shaped, 100 kilometers long and 30 kilometers wide, with an area of 1,130 square kilometers and an average elevation of about 900 meters. It is also the largest volcanic lake in the world.

*Lake Tawar: Located in the central part of the Special Region of Aceh, at the northern tip of Sumatra. Most coffee produced in North Sumatra is Gayo, mainly of the Ateng variety. Coffee produced at the northern end at Lake Tawar can be called Aceh coffee or Lake Tawar coffee, and its area is less than one-tenth that of Lake Toba. However, in recent years its coffee quality and output have surpassed those of Lake Toba.

Gayo Highlands Aceh: Aceh is at 1,110 to 1,300 meters above sea level, located in the northernmost corner of Sumatra. In Aceh Province, North Sumatra, Gayo coffee is grown on slopes around the town of Takegon and beside Lake Tawar, with an average elevation of 1,110 to 1,300 meters. The coffee is grown by smallholders under shade trees. Wet processing makes the coffee cleaner, but it usually lacks the flavor characteristics of Sumatra coffee. This coffee processed by traditional methods is similar to coffee from Sumatra's Mandheling region. Its advantages lie in showing unusual flavors and a low, lively syrupy body.

Because of long-term political instability, Aceh is not an area that ordinary people would visit. The Gayo people are resolute and hardworking, and nearly 20% of coffee processors are women.

FLORES: Flores is a small island about 320 kilometers (200 miles) east of Bali. It is one of the Indonesian archipelago and lies at 1,200 to 1,700 meters above sea level. As a region that entered the coffee industry relatively late, it has also established a good reputation in coffee growing.

In the past, a large portion of the coffee produced in Flores was sold domestically or exported blended with other coffees, and it was rarely sold directly under the name "Flores coffee." The island has active and dormant volcanoes, among which the mixture from Mount Bajawa has had a greatly positive impact on the main growing areas. In terms of processing, semi-washed is the most common method in the region, while some still use fully washed processing. The harvest period is from May to September.

Timor: Divided into East Timor and West Timor, coffee originated there in the early 20th century. East Timor has not used chemicals or chemical fertilizers for the past 25 years, and it should be the world's largest organic coffee producer. However, due to political instability in East Timor and export difficulties, most of the beans currently available are from West Timor.

Bali: Although it is part of Indonesian coffee, Balinese coffee farmers believe that Indonesian coffee quality is uneven and unworthy of Bali's high-quality coffee, so they have established their own identity, calling it "Bali coffee" to distinguish it from Indonesian coffee. Bali not only produces Arabica coffee beans, but is also rich in Robusta. According to materials, Bali Golden Coffee is made by grafting the roots of Arabica coffee trees with the branches and leaves of Robusta coffee, commonly known as the "Catimor" variety.

Coffee was introduced to Bali relatively late, and was first planted in the Kintamani Highlands at 1,000 to 1,500 meters above sea level. In 1963, Mount Agung erupted, killing more than 20,000 people and extensively damaging eastern Bali, severely affecting coffee production. From the late 1970s to the early 1980s, the government distributed Arabica seedlings to promote coffee production, but some believe the effect was limited, because today about 80% of the island's output is Robusta. Although tourism is the largest source of income, agriculture still employs the most people on the island. In the past, the largest buyer was Japan. The harvest period is from May to October.

*Luwak coffee: Luwak coffee comes from Bali. It is famous not because of its origin, but because of a unique new processing method. After a mammal called the civet eats ripe coffee cherries, only the flesh on the outside of the fruit is digested, and the extremely hard original coffee beans are excreted. They then undergo manual selection, washing, drying, deodorizing, screening, processing, roasting, and several other steps to become "cat poop coffee." This coffee has a scarce output and, because of its rarity and special taste, has become one of the rarest coffees in the world and also one of the most expensive.

Today some companies simply create a product also called "Kopi Luwak," by artificially farming and feeding coffee cherries to civets. Wild civets that are captured are locked in iron cages for three years, continuously fed and made to excrete coffee beans, many suffering from malnutrition, psychological trauma, and other problems (zoochosis), and dying because they cannot adapt to nature.

Varieties: More than 20 Arabica varieties circulate in Indonesia's commercial coffee market. Common ones include Caturra, Catimor, Timor hybrid, Typica, Robusta, Liberica, Ekselsa, and Sidikalong. The best known is Typica, the original cultivated variety introduced by the Dutch. When Indonesian coffee was hit by leaf rust, many Typica varieties disappeared by the late 1880s. However, on Sumatra, Sulawesi, and Flores, especially in high-altitude and remote areas, Typica varieties from Bergandal and Sidikalang may still be found.

There is also Long Berry Mandheling, also called TimTim, which is a bean from Indonesia. Because of its long shape, many people call it horse-face bean, and some also call it long-strip Mandheling. In fact, TimTim is not a pure variety, but a natural hybrid of Arabica coffee trees and Robusta coffee trees. This variety was discovered on Timor Island in the 1940s and was cultivated because of its natural disease resistance. In the Americas, this variety is called Hybrido de Timor, abbreviated as Tim Tim, and in Indonesia it is also called Bor Bor.

After coffee beans are screened by size, some producers store the coffee for one to three years before selling it. This process gives the coffee a very mild and warm character, with woody and cinnamon notes. Fresh beans slowly change color, from dark yellow to brown.

| Processing Methods: The three main processing methods are sun-drying, semi-washed, and fully washed. Because of the humid climate and frequent rain, in order to pursue more efficient drying, the commonly used method is [wet hulling]:

Most coffee farmers also pick only fully red coffee cherries. After collecting the coffee cherries in the morning, they remove the skin and pulp in the afternoon. Sumatra's natural environment is superior, and most of the water used is mountain spring water.

1. The coffee fruit is peeled, and the parchment beans are placed into a large bucket or tank filled with water, and defective floating parchment beans are skimmed off the surface.

2. The dense parchment beans that sink to the bottom are washed briefly, then taken out and put into a bucket or plastic bag for brief dry fermentation, that is, allowing the pectin sugars on the surface of the parchment to ferment and enhance flavor. Basically, the longer the fermentation time, the heavier the acidity. Fermentation time varies from person to person, generally only a few hours, but some estates omit the dry fermentation stage and directly sun-dry the parchment beans, which can suppress acidity and increase the syrupy mouthfeel, while allowing the pectin sugars to fully ferment and increase flavor. The fermentation time is usually between 12 and 36 hours, depending on the specific situation.

3. The parchment beans are sun-dried for one to two days, until the moisture content of the beans reaches 30%-50%. The beans are still half-hard and half-soft. The parchment is scraped off with a huller and then dried again to accelerate the drying process. After about two days, when the moisture content reaches 12%-13%, the coffee beans are collected into woven bags, usually 40 kg and 80 kg per bag, and sent to a coffee processing factory for hulling. The process is then complete, taking about four days in total.

Risks of [wet hulling]: The beans are easily damaged and cracked into sheep-hoof shapes, and the chance of contamination by mold, fungi, and yeast

| Green bean grading: Defective beans are a major factor that ruins the final coffee flavor, so removing defective beans is also a necessary final step in green bean processing. Therefore, the proportion of defective beans, supplemented by screen size, is also used as a grading method. Due to the rise of the specialty coffee trend, coffee-producing countries are paying more and more attention to coffee quality, and controlling defective beans is the most important way to do so, so using the proportion of defective beans as a grading method or supplementary basis is becoming increasingly common. Indonesian coffee beans use this grading method based on the proportion of defective beans. Indonesian beans are mainly divided into 6 grades, namely G1 to G6.

Grading by defect rate (based on 300g), grade standards: G1 Grade1 total defects less than 11, G2 Grade2 total defects greater than 12 and less than 25, G3 Grade3 total defects greater than 26 and less than 44, G4a Grade4a total defects greater than 45 and less than 60, G4b Grade4b total defects greater than 61 and less than 80

G5 Grade5 total defects greater than 81 and less than 150, G6 Grade6 total defects greater than 151 and less than 225

Common abbreviations used in Indonesian green coffee bean exports include:

Processing method indications: WP=WetProcessed-wet hulling method; DP=DryProcessed-dry processing/sun-dried; AP=AfterPolished-polished (polishing removes silver skin)

[Aged Mandheling]

The purpose of aging green beans by extending storage time is to achieve natural aging (usually 2 to 3 years). These changes include reduced acidity, color change, and thicker bean body. The storage environment must be cool and ventilated, and the process must be carried out under strictly and carefully controlled conditions, with regular even turning and adjustment of humidity and ventilation to prevent insect damage or mold.

Flavor: After the passage of time, it has less of the wildness of Mandheling, and the mouthfeel is richer and more delicate. After aged processing, the coffee beans have weaker acidity but higher body, a thicker texture, and a sense of mature steadiness, completely different from the lively brightness of new beans. The acidity becomes very soft, and the mouthfeel is rounder and easier to drink, just like ripe Pu'er. It smells of pleasant pine wood, with some herbal and cocoa flavors, as well as a lasting caramel-like sweet finish.

[Tiger Mandheling]

Region: Aceh

Varieties: Caturra, Typica, Sidikalong

Soil: Volcanic soil

Altitude: 1500m

Processing method: Wet hulling method

Flavor: The mouthfeel is relatively balanced, with high cleanliness, and obvious cream, dark chocolate, and nutty flavors.

[West Java Coffee]

Region: Mount Tangkuban Perahu, Indonesia

Altitude: 1400–1600 meters

Roast level: Light

Processing method: Honey processing

Flavor: Strong fruity aroma, with tropical fruit, plum, and jackfruit flavors, clean with a sweet finish.

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