07/05/2026
We started the morning at Hachi, the micro mill situated just up from the Hartmann family home.
The Hachi Coffee Project was built as a collaboration between Allan Hartmann of Panama, Diego Bermudez of Colombia, and Mathias Guenther of Brazil.
Here, Allan, together with Elke and Diana Hartmann, brings generations of farming knowledge from Panama and access to exceptional fruit grown high in the cloud forests around Santa Clara, with Diana, a licensed Q Grader, heavily involved on the sensory side. Elke meanwhile feels like the glue of the entire operation. Warm, incredibly hard working, and somehow across everything at once.
The idea behind Hachi was to challenge conventional ideas of coffee processing and explore how far flavour could be pushed through controlled fermentation and post-harvest experimentation.
And they rattled the specialty coffee world doing it.
Elke took us through the Hachi micro mill itself. Small fermentation tanks sit close to the house so protocols can be monitored and adjusted quickly if needed.
Inside another room sat bags of dried cherry fresh off the African beds, carefully labelled according to nanolot and protocol.
Then into the dry milling section. The parchment remover only comes into play once contracts are finalised and the coffee is close to shipment, helping preserve freshness and stability for as long as possible. Then through the screen size graders and density sorters.
Inside the cupping room, scientific flasks and glassware could be seen like a small laboratory.
Geisha lots have moved through sous-vide style protocols. Reverse fermentations. Inverted, cascade and symbiotic processes. Oxidative washed profiles. Even Parainema lots adjusted with Geisha mosto to elevate florality and soften rougher herbal characteristics.
We cupped two great tables.
One entirely Geisha. Clean, layered and technically impressive across the board.
And another including Caturra, Parainema, Maragogype, SH3 and Natural Typica. The Typica in particular was beautiful. Sweet, super clean and expressive.
Thank you Elke, Allan and Diana for the incredible hospitality and generosity. Our house is your house on the Gold Coast.