Japanese Hishio and Ancient Fermented Pastes: The Pre-Miso Tradition and Koji Paste History
Japan — Yayoi period origins; direct ancestor of miso and soy sauce
Hishio (醤) — the ancient fermented paste tradition of Japan — predates both miso and soy sauce, representing the earlier form from which these modern condiments developed. The word hishio appears in Nara-period records and describes a class of fermented preparations made from proteins (fish, shellfish, or legumes), salt, and koji in various combinations. The grain-based ancestor of miso, the fish-based ancestor of fish sauce, and the earliest prototypes of umami concentration through protein fermentation all fall under the hishio umbrella. Three categories: koku-bishio (grain-based fermented paste — direct ancestor of miso), uo-bishio (fish-based fermented paste — related to fish sauce), and shishi-bishio (meat-based fermented paste — less common today). Contemporary craft fermenters in Japan and abroad have revived hishio as a distinct product: freshly made hishio from rice koji + soy sauce fermented for 1-3 months produces an intensely flavourful paste with concentrated umami and a characteristically rich, sweet-soy complexity. Unlike completed miso (which is fully fermented and stable), hishio retains more active enzyme activity and evolves continuously, requiring monitoring and stirring. The revival of hishio connects to the broader koji fermentation renaissance driven by researchers like Nakaji Shuji and the global influence of the Noma fermentation programme. In contemporary applications, hishio functions as a direct condiment (applied to raw vegetables, tofu, steamed rice), as a marinade base, and as an umami intensifier in cooked preparations.