Yamasa is one of the great names of Japanese shoyu, a house brewing soy sauce in Chiba since the seventeenth century, and this is its naturally brewed koikuchi, the classic dark soy sauce that defines the Japanese table. Fermented in the traditional way from soybeans, wheat, and brine with koji culture, then patiently aged, this Yamasa soy sauce represents authentic Japanese soy sauce at its most dependable and refined, a clear step above everyday blends.

Its quality announces itself in the glass. Where lesser sauces look flatly black, this one pours a brilliant, translucent red amber, the mark of a well brewed shoyu. The flavour is deeply savoury and rich in umami, yet crisp and clean rather than heavy, carrying the fresh, faintly spicy aroma that is Yamasa’s signature and a balanced finish that never overwhelms.

This balance makes it endlessly useful. It is exquisite as a dipping sauce for sushi and sashimi, where its clarity and aromatic lift flatter delicate raw fish, and it seasons with equal grace, building the backbone of dashi based sauces, marinades, glazes, dressings, and simmered dishes. Supplied in an 18L bag in box, it brings the consistency and value a professional kitchen needs.

Why choose Sea House Yamasa Soy Sauce?

• A historic Japanese maker. Brewed by Yamasa, a Chiba house with centuries of shoyu craft behind it.
• Naturally brewed koikuchi. Traditionally fermented and aged for authentic depth, not a quick blend.
• Brilliant colour and aroma. A clear red amber tone with a crisp, fragrant, faintly spicy character.
• Rich yet balanced umami. Deeply savoury but clean and refined, ideal for delicate raw fish.
• Professional bulk format. An 18L bag in box for consistent, high volume service.