Koji hot sauce is rare for one reason: it takes too long. Our #KojiHachi line is built with Aspergillus oryzae, the same koji culture behind miso, soy sauce, and sake, and every batch ferments for a minimum of eight months. Reserve batches run two to four years.

What koji does is enzymatic. Across those months, its enzymes break the pepper's proteins and starches down into free amino acids and glutamates. That is where the deep, savory, mouth-filling character comes from, and it is not something you can add at the end of a production run.

Three peppers, three results. Jalapeño #KojiHachi trades grassy sharpness for warm, silky heat and a natural sweetness. Fresno #KojiHachi opens fruity and lightly smoky, and took Bronze at the 2024 International Flavor Awards. Habanero #KojiHachi carries real habanero heat into a sweet, umami-rich finish. The Koji Flight puts all three side by side.

Peppers grown within thirty miles of our kitchen. Fermented in small batches in the Red River Valley. Free U.S. shipping on orders of $40 or more.

You can't cheat time. We never tried.