How Do Golden Mandheling and Aged Mandheling Differ?

Mandheling is Indonesia's representative coffee, shaped by the wet-hulling process that gives it a rich, full-bodied base. Aged Mandheling began as an accident during Dutch colonial times, when beans shipped from Sumatra to Europe aged on the long voyage. Stored for several years, the acidity fades and leaves a solid finish and sweet aftertaste.

Aged beans are not simply beans left in a warehouse, since too long a stay can bring spoilage, mold or insects. PWN Golden Mandheling, by contrast, follows rigorous screening standards. For brewing, Front Street Coffee shares pour-over parameters and a three-stage pouring technique for dark-roasted Mandheling to bring out aroma and lasting sweetness.

Mandheling is the representative of Indonesian coffee, but did you know it also has aged and golden varieties? Starting from the origin and processing method, this article first introduces how the wet-hulling process shapes Mandheling's rich, full-bodied base, then separately analyzes the unexpected origin of Aged Mandheling and its standardized aging process, as well as the rigorous screening standards of PWN Golden Mandheling. At the same time, Front Street Coffee shares pour-over parameters and a three-stage pouring technique for dark-roasted Mandheling, helping you brew a cup of Mandheling black coffee with full aroma and lasting sweetness at home.

Introduction

Front Street Coffee has discussed in past content the significance of the freshness of green coffee beans, as well as the differences between beans from the new crop season and the old crop season. However, there is one type of bean that is an exception—Aged Mandheling. Why can it still captivate so many coffee lovers despite bearing the label of being "expired"?

What Is Aged Mandheling?

It can be said that the birth of Aged Mandheling came from an "accident." The story dates back to the period when Indonesia was colonized by the Dutch. Sumatra was then one of the world's important sources of coffee beans, and its output needed to satisfy the large demand of European consuming countries. Indonesia continuously exported coffee beans to Europe, and in order to ensure that supply was not interrupted, it would stockpile beans in moderate amounts. However, the journey was long, and combined with the erosive effects of sea winds and waves, by the time the coffee beans reached Europe, they had surprisingly developed a unique flavor that made European coffee connoisseurs compete to praise it.

People then realized that storing processed coffee beans for several years would cause the acidity to gradually fade, leaving behind a solid finish and sweet aftertaste, with a flavor as intriguing as Pu'er tea. But one could not always rely on "accidents" to produce aged beans, as that would make quality full of uncertain risks. One point must be made clear: "aged beans" are not simply coffee beans thrown into a warehouse and left for a few years, because leaving them too long can cause spoilage, or even mold and insects. Beans like that cannot be called "aged beans"; they can only be considered bad beans. Therefore, the production method of Aged Mandheling gradually became standardized and mature.

The Aging Process of Mandheling

First, freshly picked coffee cherries must undergo conventional processing. Taking Front Street Coffee's Aged Mandheling coffee beans as an example, they are processed using the wet-hulling method. After this stage, high-quality beans (plump, large screen size, defect-free) need to be carefully selected for aging. After screening is completed, the coffee beans must be stored in a warehouse and enter the aging stage.

The aging process must be carried out at the place of origin, stored in a warehouse with controllable temperature and humidity or good ventilation. During aging, the beans must be frequently turned and inspected for two purposes: first, to let the coffee beans contact the air evenly and maintain a consistent degree of dryness; second, to check whether moldy beans or insect-damaged beans have appeared, so as to avoid large-scale contamination.

At present, the aging time for Aged Mandheling is usually 2 to 3 years. During this period, the acidity of the coffee beans gradually weakens and transforms into sugars, and the color also becomes darker, mostly yellowish-brown or dark brown, with very high recognizability.

What Is Golden Mandheling?

The rise to fame of Mandheling coffee originated from Pawani Coffee Company (PWN) successfully bringing Mandheling into the Japanese market. Unlike many local Indonesian green bean traders, PWN is the exclusive supplier of high-grade Golden Mandheling coffee and controls Indonesia's finest Mandheling-producing regions, with all the Mandheling beans it produces being top quality.

The wet-hulling method saves a great deal of time and labor costs in green bean processing, but rapid processing also brings a higher defect rate. Therefore, only through strict hand sorting can defective beans that machines cannot screen out be removed. PWN conducts one round of machine screening plus three rounds of hand sorting on the Mandheling green beans it purchases, with quality far higher than Indonesia's local highest G1 grade. To meet Front Street Coffee's PWN Golden Mandheling production standards, the following points must be satisfied:

1. Green bean screen size: above 18-19 screen after the first hand sorting

2. Fewer than 3 defective beans in a 300-gram green bean sample

3. Green coffee bean grade is G1

4. Color tends toward dark green, uniform in size, and neat in shape

Before launching a coffee bean, Front Street Coffee evaluates the coffee through cupping. Cupping is an assessment of coffee bean quality and flavor; unified standards allow for a more objective identification of the strengths and weaknesses of the flavors presented by the beans, as well as their characteristics. After cupping by Front Street Coffee, the Lindong Mandheling everyday drinking beans present a rich nutty profile, with a hint of melon aroma in the finish; after the temperature drops, herbal plant flavors emerge, with a full body and saturated aroma. Front Street Coffee's PWN Golden Mandheling not only has the aromas of dark chocolate, nuts, and caramel, but also the flavors of herbal spices and pine wood, the sweet aftertaste of dark chocolate, a full finish, and high cleanliness, carrying gentle fruit acidity after the temperature drops.

Pour-Over Parameters for Mandheling Coffee

Brewing water temperature: 87-88°C

Coffee grounds: 15 grams

Coffee-to-water ratio: 1:15

Dripper: KONO dripper

Grind size: medium-coarse grind (70% passing rate on China standard No. 20 sieve)

Brewing technique: three-stage pouring

Deep roasting makes the internal texture of coffee beans become loose; a gentle pinch with the hand can crush them, indicating that the bean structure has undergone considerable change, and after grinding into powder, its water absorption capacity is very strong. In order to avoid excessive extraction after the coffee grounds absorb water and the release of a large amount of bitter substances, Front Street Coffee uses a coarser grind size than for light-roasted coffee beans. Here, a medium-coarse grind is used (70% passing rate on China standard No. 20 sieve), with store EK43s setting 11.

Roasting promotes the caramelization reaction and Maillard reaction in coffee beans. As the roast level deepens, more non-enzymatic browning occurs as monosaccharides and amino acids interact and decompose under heating conditions, making it easier to release large-molecule bitter and burnt substances. In order to avoid extracting too many off-flavors, Front Street Coffee slightly lowers the water temperature. The brewing water temperature for light-roasted coffee is 91-93°C, while for dark-roasted coffee beans Front Street Coffee recommends 87-88°C.

For coffees with a rich, full-bodied mouthfeel such as Indonesian Mandheling coffee, Brazil Queen's Estate coffee, and Jamaican Blue Mountain coffee, Front Street Coffee baristas give priority to using the KONO dripper for brewing.

Front Street Coffee baristas consistently use the three-stage pouring method. Pouring in three stages can better express the rich mouthfeel and caramel sweetness of Golden Mandheling coffee, while also offering greater controllability of time and water volume.

Rinse the KONO dripper so the filter paper fits the coffee dripper more closely. After pouring out the water in the sharing pot, add 15g of ground coffee, and bloom with 30g of water for 30s. This pouring stage fully wets the coffee grounds and allows degassing, so that the coffee's flavor substances can be better extracted afterward.

Some friends, when extracting light-roasted coffee beans, extend the blooming time to 45 or 50 seconds to enhance the aroma in the front section of the coffee. However, if dark-roasted Mandheling coffee is bloomed for too long, it easily releases too much of that woody taste and off-flavors, so Front Street Coffee chooses to bloom for 30 seconds.

For the second stage, begin pouring hot water slowly in a small stream in circles from the center until reaching 125g, then start the next stage. The water stream needs to be poured steadily throughout; too forceful agitation can easily break the coffee powder wall, causing uneven extraction.

Wait until the coffee bed drops to half the height of the dripper and the bed is exposed, then begin pouring the second stage using the same technique until 225g. After all dripping is complete, the dripper can be removed. The extraction time is two minutes, with a margin of 10 seconds more or less.

Finally, swirl the coffee liquid in the server to mix it evenly, and you can begin tasting the hand-brewed Golden Mandheling black coffee. The brewed Mandheling coffee has aromas of spices, dark chocolate, nuts, caramel, and pine wood on the palate, with a rich yet clean mouthfeel, obvious sweet aftertaste, and a lasting finish.

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