How Does Red Wine Processing Change Arabica Coffee?

Ethiopian arabica coffee usually follows washed or natural processing, so red wine processing stands out as a rarity. The Delly G1 beans come from the Guji region, grown at 2000-2200 meters from local heirloom varieties. Carbonic maceration, the method behind red wine processing, gives the cup a distinctive fermented fruit character that sets it apart from typical Ethiopian offerings.

Guji was part of Sidamo until the Ethiopian Commodity Exchange made it a separate region in 2010. The area sits southeast of Yirgacheffe, with black soil nearly two meters deep and average altitudes above 1800 meters. Wide day-night temperature swings support slow cherry maturation, a key factor in the flavor development tied to coffee processing. Pour-over parameters and roast curves complete the picture.

Ethiopia, as the birthplace of Arabica coffee, usually employs washed or natural processing, with honey processing already being rare, and red wine processing being even more of a rarity. The Ethiopian Deli coffee shared by Front Street Coffee this time comes from the Guji region, uses the red wine processing method (i.e., carbonic maceration), is of the local heirloom variety, at an altitude of 2000-2200 meters, and is Grade G1. The article will guide you through the terroir conditions of the Guji region, the principles and characteristics of the red wine processing method, and include Front Street Coffee's roasting curve and pour-over suggestions to help you fully understand this uniquely flavored coffee.

Many coffee enthusiasts take their first step into the world of specialty coffee because they are attracted by Ethiopian beans. However, the vast majority of coffee produced in this country follows the washed or natural route, with honey processing being considered rare, let alone red wine processing. The Ethiopian coffee that Front Street Coffee is introducing today is precisely made using the red wine processing method.

Ethiopia GUJI Hambella Deri

Ethiopia Deli

Producing Country: Ethiopia

Region: Guji

Variety: Local Heirloom

Altitude: 2000-2200 meters

Grade: G1

Processing Method: Red Wine Processing

Ethiopia Guji

Located in Africa, Ethiopia is globally recognized as a famous coffee-producing country. Among the many producing regions, Ethiopia's status is almost legendary: on the one hand, it is the birthplace of Arabica coffee; on the other hand, the coffee produced here has a distinct flavor profile compared to other countries.

The Guji region has attracted much attention in recent years, with outstanding performance in flavor and quality. It was originally part of the Sidamo region and was designated as a separate new region by the Ethiopian Commodity Exchange (ECX) in 2010. Guji is located southeast of Yirgacheffe, adjacent to Sidamo and Gedeb, with complex and diverse terrain, including towering mountains, highlands, plateaus, valleys, and plains.

The soil in this area is fertile black soil (Vertisol), with a soil depth of nearly two meters and an average altitude of over 1800 meters. The significant temperature difference between day and night brought by the geographical conditions gives the area all the terroir advantages needed to produce high-quality specialty coffee. The greatest strength here lies in the maintenance of soil vitality through the natural cycle of organic matter—fallen branches and leaves from surrounding trees, plant residues, etc., all turn into natural fertilizer.

Local Heirloom Variety

Those who often drink Ethiopian coffee should be familiar with the name "Heirloom." Most coffee varieties in Ethiopia are named this way because the number of local varieties is too vast, like a natural gene pool of Arabica coffee. On the one hand, the numerous varieties make identification and classification extremely difficult; on the other hand, the Ethiopian government, for protection reasons, is unwilling or unable to disclose specific information about these varieties. In agricultural planting, the concept of variety is usually given a name only after breeding, but coffee, as a native crop, is not artificially planted, and various varieties naturally grow mixed together, hence collectively called "Heirloom," which is also the root of its rich, varied, and hard-to-control flavor.

Red Wine Processing

Red wine processing, also known as carbonic maceration, is inspired by winemaking techniques. Traditional winemaking involves pressing grapes before fermentation, while this processing method places whole clusters of red grapes directly into a sealed container filled with CO2, undergoing slow anaerobic fermentation, ultimately producing a red wine with a lighter color, rich fruity aroma, and excellent taste.

Transplanting this concept to coffee processing involves first removing the pulp and skin of the coffee fruit, then placing it in a stainless steel fermentation tank, introducing carbon dioxide and expelling oxygen to create a sealed anaerobic environment, allowing the coffee fruit to undergo strictly controlled anaerobic fermentation, thereby producing richer aromatic substances and high-quality acidity.

Front Street Coffee Roasting Curve Analysis

Roaster Yangjia 800N (batch size 300g)

When the drum temperature rises to 160°C, charge the beans, adjust the damper to 4, set the gas to 120; the turning point appears at 1 minute 26 seconds, at a temperature of 107.1°C; when the drum temperature reaches 140°C, the bean surface begins to turn yellow, the grassy smell completely dissipates, entering the dehydration phase; at 152°C, reduce the gas to 110; when the drum temperature reaches 166°C, adjust the gas to 90, keeping the damper unchanged;

At 7 minutes 28 seconds, irregular wrinkles and dark spots appear on the bean surface, and the aroma of toasted bread clearly transitions to coffee fragrance, which can be seen as a precursor to first crack; at this point, carefully listen for the cracking sound of first crack. First crack begins at 8 minutes 13 seconds, adjust the damper to 5 (be very cautious when adjusting the gas, not so low that you can't hear the cracking sound); after first crack, develop for 1 minute 40 seconds, and drop the beans at 196°C.

Cupping Flavor: Fermented wine aroma, red wine, grape, tropical fruit

Front Street Coffee Brewing Parameters

Front Street Coffee recommended brewing method: Pour-over 1. Filter: Hario V60 2. Grind size: Medium-fine (BG 5T: 58% passing through Chinese standard No. 20 sieve) 3. Water temperature: 90°C 4. Coffee-to-water ratio: 1:16 5. Brewing technique: Pulse pouring

First, bloom with 30g of water for about 30 seconds, then pour 90g of water in a small stream circling in the center, completing the pulse when the total water reaches 120g; when the water level drops and is about to expose the coffee bed, continue pouring water until 240g to finish; when the water level drops again and is about to expose the coffee bed, remove the filter (timing starts from the beginning of blooming), total extraction time is 1 minute 50 seconds.

Flavor: The wet aroma carries red wine and rose notes; on the palate, there are flavors of jackfruit, grape, and toffee, with a slightly tea-like finish.

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