Ikedaya Jozo — A Brewery Born in 1792

Hi, I’m Mido, a writer for SaruKuma.

Today I’m introducing Ikedaya Jozo, a historic miso brewery located in Kyomachi, Chuo-ku, Kumamoto City.

Founded in 1792 during Japan’s Edo period, Ikedaya Jozo has been crafting miso for over 230 years. Today they offer a hands-on miso-tsukuri (miso-making) class that takes about an hour — and you leave with up to 5.2 kg of your own homemade miso. Along the way, you’ll learn about fermentation and koji, the mold-cultivated grain that is the foundation of Japanese fermented foods like miso, sake, and soy sauce.

From the Torimachi-suji shopping street, follow the road in front of Kumamoto Castle and the Traditional Crafts Museum — Ikedaya Jozo is about 700 meters from the castle. Parking is available: look for the signboard and park in the tandem spaces. By bus, depart from the Kotsu Center bus terminal and get off at Saibansho-mae (Courthouse stop) — it’s a 1-minute walk.

Miso-Making Class Details:
Days: Weekdays only (no classes Saturdays, Sundays, national holidays, New Year, or Obon)
Reservations required — book by phone or in person at least 2 business days in advance.

Session times:
Morning session: 10:30 – 12:00
Afternoon session: 13:30 – 15:00

Fees (tax included):
・Mugi (barley) miso: ¥2,490 → approx. 5.2 kg
・Kome (rice) miso: ¥3,140 → approx. 5.2 kg
・Awase (blended) miso: ¥2,830 → approx. 5.2 kg
※ Option: add shoyu-no-mi koji (soy sauce koji) for ¥210 per packet
・Genmai (whole-grain brown rice) miso: ¥2,120 → approx. 2.5 kg

Capacity: Up to 25 participants (solo visitors welcome).
What to bring: Apron, head covering (triangular bandana), hand towel, and an eco bag to carry your miso home.

Ikedaya Jozo also offers outreach sessions at schools and community centers — contact them for details. Saturday sessions may be available on request.

The shop sells finished miso, koji, dressings, and more — all ideal as edible souvenirs to take home.

Shikomi miso — pre-prepared but not yet aged miso — is also for sale. Take it home and age it to your own preferred depth of flavor, watching the color deepen week by week as fermentation works its magic.

An impressive variety of koji types on display. Koji is the mold-cultivated grain at the heart of Japan’s entire fermented food tradition — miso, sake, soy sauce, and amazake all rely on it.

Finished miso, soy sauce, and original dressings — a tempting shelf of distinctly Japanese flavors worth bringing home.

In the corner of the miso-making space, there’s a small kids’ play area: a shoeless floor space with toys where little ones can settle in comfortably while parents work on their miso. A genuinely thoughtful touch for families.

Step by Step: The Miso-Making Experience

Ikedaya Jozo makes it easy for first-timers to craft genuinely delicious miso. On my first visit I chose the awase miso (blended miso) — a combination of rice and barley miso that is mild, versatile, and great for everyday cooking.

Each mixing bowl comes pre-loaded with koji — one bowl holds exactly one person’s portion of ingredients. (Pictured after measuring and adding salt.)

Start by mixing everything together thoroughly, then fold in the cooked soybeans and their cooking liquid.

The soybeans are softened and thoroughly mashed beforehand — they blend smoothly right into the koji and salt mixture.

Measure out your portions, add them to the bowl, and mix until the texture is fully consistent. The instructor walks you through every step with patience and care.

While you mix, the instructor shares fascinating insights: how miso acts as a kakushi-aji (hidden flavor enhancer that quietly deepens a dish without announcing itself), what koji does during fermentation, and the cultural history of miso in Japanese daily life. You walk away knowing far more than you expected.

Roll the miso into balls and press them firmly into plastic bags, squeezing out any air pockets. Two bags yields approximately 5.2 kg of miso to take home.

The ideal aging temperature is around 27°C — roughly comfortable room temperature. Keep the bags flat in the living room, and flip them top-to-bottom once a week so the liquid distributes evenly. My kids took on the turning as their weekly job; we all love peering at the changes visible through the transparent bags.

Tasting the Results — and Why This Is Perfect for Families

During the class, the instructor mentioned something worth trying: at the 20-day mark, taste your hatsuka miso (twenty-day miso). Not yet fully fermented, it carries a lightly sweet, gentle flavor found nowhere else. We made miso soup with it first — the whole family loved the soft sweetness. We also tried it mixed with mayonnaise on cucumber slices, which was surprisingly delicious.

There’s a saying that miso stirred by a child’s hands turns out especially tasty — and honestly, we believe it. Bring your kids to Ikedaya Jozo; aging your own miso at home becomes a surprisingly joyful daily ritual that the whole family can share.

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Frequently Asked Questions

※ Information is current at the time of writing. Prices and hours are subject to change. Please confirm before visiting.