Colombia - La Sirena - Castillo - Koji Natural

LIMITED EDITION SERIES - Shipped freshly roasted after 07.07.2025

Full-bodied aroma : A full-blooded natural coffee. The koji fermentation in the coffee cherry brings strong, complex notes of molasses, papaya, rum, and black tea . An intense fruit bomb .

High-end fermentation : KOJI fermentation from Asian cuisine. The KOJI fungus ( Aspergillus oryzae ) is used in the production of soy sauce and miso.

Direct trade: Transparent origin and fair remuneration through direct trading relations with the coffee farmers.

Sens Coffee - Castillo - Koji

Juan David Puerta is known for his distinctive co-fermentations. The koji-fermented Castillo is just one of his creations, but one of the few that doesn't fall under the category of "infusion" coffees. Since no direct fruit notes are added here, but rather microorganisms are added for fermentation, this is a "pure" co-fermented coffee.

The Aspergillus oryzae fungal spores convert the starch contained in the coffee cherry into simple sugars. The flavor nuances of the coffee are greatly enhanced. Therefore, this coffee is not just a genuine natural coffee, but a truly powerful coffee in terms of taste.

Juan David Puerta - Food engineer dedicated to coffee processing

After studying food engineering, Juan David initially gained experience at various green coffee producers and exporters. Instead of permanently settling into existing structures, however, he decided to apply his expertise to his business. He rented space on a farm, sourced fresh coffee cherries, and has since focused entirely on unusual processing methods. These include osmotic dehydration with natural flavors and fermentation with koji fungus—two processes that break new sensory ground.

What makes Juan David particularly likeable is his open, honest approach. While some producers keep their methods secret or only selectively disclose information, he stands by his processes – transparently, without marketing platitudes. It's precisely this attitude that deserves support. That's why we're convinced this koji coffee won't be the last one from him in our range.