Café Izuba and the Economics of Fermentation

Linda Mugaruka and Moise Dunia Muhindo did not seal their coffee in oxygen-free tanks because anaerobic fermentation is fashionable in specialty circles. They did it because the technique creates measurable value from every kilogram harvested. In South Kivu that is not a fashion choice but a calculated response to a season where reaching the plantation became harder, logistics more constrained, and farmer income more precarious. Their coffee, Café Izuba, is the Democratic Republic of Congo's first anaerobic coffee, and it leads the 2026 Best of Congo Cooperatives auction.

The auction runs September 1-3 on the M-Cultivo platform, featuring 32 traceable microlots from cooperatives in eastern DRC. Fourteen international winners will be auctioned; eighteen national winners are available through an offer sheet closing September 10. Bids start at $13 per kilogram, with lot sizes ranging from 86 to 300 kilograms. The coffees come from elevations averaging 1,570 meters, grown between the shores of Lake Kivu and the slopes of the Rwenzori mountains.

The Same Conversation, Different Constraints

An auction like this only works if there is a buying side that cares about origin, processing method and traceability. Sofia has spent the past five years building exactly that buying side. Roasteries here source by origin, track processing methods, and communicate traceability to customers who ask questions. A roaster at Aroma Coffee evaluating a green bean lot is working inside the same global system that Mugaruka and Dunia Muhindo are building in South Kivu. The difference is that DRC producers are doing it under conditions that would stop most operations entirely.

Choosing to produce an experimental anaerobic coffee like Izuba is far more than a technical innovation. It is an economic, social and symbolic response to the challenges facing producers.

Linda Mugaruka and Moise Dunia Muhindo

Scoring Creates Market Access

The Best of Congo Cooperatives program, launched in 2024 by African Coffee Connect and CongoAgri Platform, is not a charity initiative. It is a market-access mechanism. Scoring and traceability create the conditions for producers to command prices above commodity rates. The 2026 program includes fully washed coffees, natural-process coffees, and anaerobic-fermentation coffees, with lots distributed to the U.S., UK, EU, and South Korea.

Seven lots were produced by women, young people, and marginalized Batwa communities, with backing from African Coffee Connect and the UK's Pact Coffee. Three of those lots are among the fourteen international auction winners.

DRC is still very early in establishing itself as a recognized specialty coffee origin. There is so much still to uncover, and I'd encourage more roasters and buyers to get involved now.

Will Corby, Director of Coffee and Social Impact at Pact Coffee

Fermentation at the Washing Station

Anaerobic fermentation involves sealing coffee cherries or parchment in tanks without oxygen, allowing controlled microbial activity to develop specific flavor compounds. The technique is used globally, from Colombia to Ethiopia. What distinguishes its application in DRC is the context: producers facing difficult plantation access and income pressure chose a processing method that adds value without requiring additional land or labor.

Фото: Виктор Младенов

The fermentation happens at the washing station, not the farm. The investment is in time and technique, not infrastructure that conflict or weather could destroy.

What a Bid Represents

A roaster evaluating a DRC lot from this auction sees the same data points they would see from any specialty origin: elevation, processing method, score, lot size, price. A bid on Café Izuba is not a donation. It is a purchase of coffee that scored high enough to reach an international auction, produced by people who made deliberate technical decisions under real constraints.

Izuba means sun in the local language, a symbol of renewal the producers chose deliberately. The auction closes September 3. The offer sheet closes September 10. After that the coffee becomes freight: scored, documented, priced and shipped to distribution points in the EU.

Frequently Asked Questions

Q: What is anaerobic fermentation in coffee processing?

A: Anaerobic fermentation involves sealing coffee cherries or parchment in oxygen-free tanks, allowing controlled microbial activity to develop specific flavor compounds. The technique adds measurable value without requiring additional land or infrastructure.

Q: When does the Best of Congo Cooperatives 2026 auction take place?

A: The auction runs September 1-3, 2026, on the M-Cultivo platform. Bids start at $13 per kilogram. An offer sheet for additional lots closes September 10.

Q: How can European roasters access DRC microlots from this auction?

A: Winning lots will be consolidated and shipped to distribution points in the U.S., UK, EU, and South Korea. Roasters can bid directly through the M-Cultivo platform or purchase from the offer sheet before the September 10 deadline.