Control
Mechanically Demucilaged
The baseline — mucilage stripped by machine before microbes can get to work.
Limited pre-orderLive global cupping — 3 October 2026
The Fermentation ProjectJames Hoffmann
One Guatemalan coffee, four fermentations — a limited tasting kit you cup along with the world.
The kit
The 2026 Tasting Kit
One clean Guatemalan lot, split four ways in the fermentation tank — everything else held constant. Taste exactly what controlled fermentation does, and doesn't do, to the cup.
What's inside
- 014 × 100 g whole-bean coffees — one per process, roasted identically
- 02The same Guatemalan coffee in every bag — fermentation is the only variable
One lot, four paths
The four coffees
Each bag holds the same lot — the only difference is what happened in the fermentation tank.
Fermented
Wild Fermentation
Naturally occurring microbes run the tank — the traditional route.
Fermented
Lactobacillus-Inoculated
Seeded with lactic acid bacteria — rounder, creamier, dairy-adjacent characters.
Fermented
Saccharomyces-Inoculated
A selected yeast strain dominates — clarity, consistency, lifted fruit.
Before you order
The tasting kit ships on its own — it can't be combined with other products in one order. Order your other coffees separately.
Delivery across Indonesia, or free pickup at the roastery in Malang.
Please note: due to logistics, we can't promise your kit will arrive in time for the live tasting on 3 October. As of writing, we're glad to say shipments are on track to make it — and we're working as hard as we can to keep it that way — but it isn't a guarantee. The session stays on YouTube afterwards, so you can cup along any time.