Inoue Shoyu
Natural brewing in Okuizumo, shaped by kura-born microbes
Based in Okuizumo, Shimane, Inoue Shoyu makes soy sauce, miso, and everyday seasonings from its long-standing brewery. The flagship "Koshiki Shoyu" is brewed with minimal intervention — no heat treatment and no added yeast to speed things up. It's a style that leans on time and the living environment of the kura. Alongside Koshiki, the lineup includes Kohaku (finished with an amazake "additional mash"), Izumo Murasaki (saishikomi), and Nama Shoyu. You'll also find ponzu, noodle soup base, dashi packs, miso, and gift sets — easy to choose for daily cooking or for sending to someone.
Why We Love It
Start with Koshiki Shoyu as a finishing sauce — over tofu, eggs, or plain rice — so the aroma and umami come through. Next, try Kohaku for vegetable dishes and clear soups when you want a gentler, rounder touch. For hot pot or steamed vegetables, keep Ai no Ponzu on hand and use it straight. And if you cook often, stocking Jun Dashi makes miso soup and simmered dishes easier to pull together.
PROFILE About the Company / Workshop
Inoue Shoyu is based in Okuizumo, Shimane, producing soy sauce and related seasonings from its brewery in Shimo-ai. The kura is described as a place where useful microbes, including kura-born yeast, live over long periods of time.
Koshiki Shoyu represents the house style: brewed with minimal intervention. It avoids heat treatment and yeast addition for speeding fermentation, and relies on a traditional approach. It works for simmered dishes and sauces, and also shines as a finishing soy sauce.
The soy sauce lineup offers clear differences: Kohaku uses an amazake "additional mash," Izumo Murasaki is a saishikomi-style soy sauce, and Nama Shoyu is also available. For everyday cooking, there are ponzu, tsuyu, dressings, and the Jun Dashi pack.
The online shop is organized by categories — soy sauce, seasonings, miso, dashi, soups, snacks, and rice cakes. Gift items include sets that combine Koshiki Shoyu, Kohaku, and Jun Dashi for a ready-to-use kitchen bundle.
A "natural brewing" approach
Koshiki Shoyu is brewed without heat treatment and without added yeast to accelerate fermentation. The process stays close to traditional brewing and lets time do its work.
A kura shaped by generations
The brewery is known for its long history and for valuing kura-born microbes. That living environment is treated as part of what supports depth and fragrance.
Simple core ingredients for Koshiki
For Koshiki Shoyu, the listed ingredients are Japanese whole soybeans, Japanese wheat, and salt. It's designed as an everyday sauce you can keep reaching for.
A broad pantry lineup, plus gifts
Beyond soy sauce, the shop covers ponzu, tsuyu, dashi, miso, and more. Gift sets are also available, combining popular staples into an easy present.
PRODUCTS Featured Products & Services
Contains promotional content
Koshiki Shoyu (house classic)
A naturally brewed soy sauce, made without heat treatment or added yeast for acceleration. Useful for simmering, sauces, and finishing.
Kohaku (finished with amazake)
Soy sauce mash finished with an additional amazake-based step. A softer profile that suits dashi-forward dishes and vegetables.
Izumo Murasaki (saishikomi)
A saishikomi-style soy sauce with concentrated umami. Great as a finishing sauce, including for sashimi.
Jun Dashi (dashi packs)
Dashi packs made from bonito and sardine/mackerel-based flakes. Handy for miso soup and quick simmered dishes.
LINKS Official Links / Social Media
- Official Website https://inoue-shoyu.jp/
- Online Shop https://inoue-shoyu-shop.com/
- Contact Form https://inoue-shoyu-shop.com/law
- Online Shop (Top) https://inoue-shoyu-shop.com/
- Soy Sauce Category https://inoue-shoyu-shop.com/item-list?categoryId=87816
- Dashi Category https://inoue-shoyu-shop.com/item-list?categoryId=87824
- Gift & Sets https://inoue-shoyu-shop.com/item-list?categoryId=87815