Close up of red coffee cherries undergoing anaerobic fermentation
Specialty Coffee Trends

Welcome to the Funk: A Guide to Hyper-Fermented Coffee

Ready to taste the future of coffee? We're exploring the cutting edge of processing—from anaerobic experiments to fruit-infused co-fermentations—that are taking the New York specialty scene by storm.

The Science of a Better Bean

It's wild, it's funky, and it's scientifically complex. To truly appreciate the explosion of flavors in your cup, we need to look at what happens at the farm level.

1. Beyond Washed & Natural

For decades, coffee lovers chose between the clean acidity of washed styles or the heavy sweetness of natural processes. Today, producers are borrowing techniques from the wine and beer industries. By meticulously controlling temperature, pH, and time, farmers are unlocking flavor precursors that were previously hidden within the coffee cherry.

2. Anaerobic Fermentation Explained

When coffee cherries are sealed in airtight tanks, oxygen is removed (anaerobic). This forces yeast and bacteria to shift their metabolic processes. The result? A dramatic increase in lactic acids—think creamy yogurt notes—and intensely distinct fruit flavors that standard open-air fermentation simply cannot produce.

Diagram illustrating the difference between aerobic and anaerobic fermentation tanks
A cross-section comparison of traditional versus anaerobic fermentation tanks.

3. What is Co-fermentation?

This is the controversial frontier. In co-fermentation, producers add foreign ingredients—like tartaric acid, wine yeast, cinnamon sticks, or fresh passionfruit—directly into the fermentation tank. The coffee beans absorb these flavors at a cellular level. Purists may debate it, but for the adventurous palate, it offers a distinct profile often described as "high-fidelity flavor."

Tasting Notes to Expect:

Boozy / Winey
Tropical Punch
Cinnamon Spice
Premium bag of El Paraiso Red Plum coffee beans next to brewed glass
New York Editor's Pick

El Paraiso: "Red Plum"

96/100 Nimbus Score
  • Origin: Cauca, Colombia
  • Processing: Double Anaerobic Thermal Shock
  • Roaster: Manhattan Coffee Roasters
  • "An absolute fruit bomb. Intense aromas of candied plum and greek yogurt hit immediately, finishing with a delicate white tea floral note."
Read Full Review See All Reviews

Brewing Guide: Taming the Funk

Hyper-fermented beans are porous and highly soluble. Adjust your routine to avoid over-extraction.

Cool It Down

Volatile esters in anaerobic coffee burn off easily. Drop your brew temperature to 90°C (194°F) to preserve the delicate floral top notes.

Coarsen the Grind

Experimental processing often softens the bean structure. Grind slightly coarser, like kosher salt, to prevent stalling your draw-down time.

Method Matters

For clarity, stick to a V60. For maximum funk, try an AeroPress inverted method. Avoid immersion brewers like French Press with these beans.

Virtual tasting event setup with coffee cupping bowls and a laptop

Nimbus Live Series

Virtual Tasting: A Journey Through Anaerobic Processes

Join our Head of Coffee and special guest producers from Colombia for a live brewing and tasting session. Registration includes a Nimbus Brew Cupping Kit mailed to your door.

Reserve Your Spot Next Session: Oct 15, 2:00 PM EST