01 / ABOUT HACKOH

About Hackoh

A perspective learned from fermentation, and a guide to this site — what you can do here, and where to start.

01— FERMENTATION

Enjoying the Fluctuations

Making miso, which once supported family tables, was never just about preserving food. It was creative time rooted in daily life — feeling the seasons, conversing with invisible microbes. No two batches were ever quite the same, shaped by place and season, and that living practice nurtured a rich food culture unique to each region.

Even when you set the environment just right, in the end you have to leave the rest to the microbes. Fermentation also means accepting a kind of "fluctuation" that humans can never fully control.

And interestingly, this "fluctuation" has something in common with the AI now on the rise. AI may look like the ultimate expression of the digital, yet it too draws unexpected answers out of vast amounts of data. Fermentation and AI seem like opposites at first glance, but at a deeper level, they resonate.

The brand name "Hackoh" is a coined word for hacking (hack — putting to clever use) fermentation (HAKKO). We build up logic, piece by piece, to untangle the black box — and enjoy whatever uncertainty remains. We hope that through Hackoh, you'll get a feel for this "fermentation mindset."

02 — OPERATED BY MITSUURA BREWERY

About the Operator

Hackoh is operated by Mitsuura Jozo, a miso brewery in Yamaguchi Prefecture, Japan.

The greatest charm of miso lies in its "regionality" — the way its flavor differs from place to place. Wanting to protect that charm, we decided to keep making only mugi miso (barley miso), the taste of Yamaguchi. At the same time, we wanted to share the fascination of fermentation itself with more people, beyond the bounds of mugi miso alone — and that wish is what led us to launch this fermentation brand, Hackoh.

About Mitsuura Jozo ↗

03 — HOW THIS SITE WORKS

What You Can Do on This Site.

Hackoh consists of two parts: this website and an app.

01

Craft — Get Your Measurements, Then Brew

Decide how much you want to make, and we'll calculate the ingredient amounts. All the calculations happen right here on the site — no account needed.

About Hackoh Craft

Hackoh Craft, which lets you freely combine proteins and koji, is currently an app-only feature. Free combinations require a safety check, and that check lives in the app — it isn't available on the website.

02

Learn — Choose How Deep You Want to Go

From a manga-style introduction to talk of molecules and numbers. Read it in order, or just skip to what interests you. 5 categories in all — no account required.

03

App — The Six Months After You Brew

Miso's real journey begins after you brew it. The app reads how aging is progressing from temperature and elapsed time, lets you know when it's ready to eat, and keeps a record of your observations. This is work only the app does — you won't find it on the website.

Release Status

The app is out on the App Store for iPhone and iPad, free. The app itself is in Japanese for now; an Android version is in preparation. Download on the App Store ↗

04

Ingredients & More

About Selling Ingredients

The ability to purchase ingredients is currently in preparation. You can still use the amount calculator and check the instructions as they are.