Japanese Tofu Regional Styles and the Okinawan Tofuyo Preserved Tofu Tradition

Tofuyo: Ryukyu Kingdom (pre-Meiji Okinawa) origin, possibly introduced from Chinese sufu via Chinese diplomatic contacts; recorded in Ryukyuan texts from 17th century; Kōya-dōfu: Kōyasan temple tradition, Wakayama, 13th century or earlier

While tofu production has been addressed broadly in Japanese culinary documentation, the regional tofu diversity across Japan's prefectures represents a distinct culinary subculture that extends well beyond the silken-versus-firm binary familiar internationally. Japan's tofu spectrum ranges from the extraordinarily silky Kyoto kinu-goshi (絹ごし, 'silk-strained', using no pressing, only coagulant in the mould) to the firm, dense, aged momen (木綿, 'cotton-strained') of Tohoku farmhouses; from Koyasan's kōya-dōfu (freeze-dried and rehydrated, used in shojin cuisine) to Okinawa's tofuyo (豆腐よう) — possibly Japan's most extraordinary tofu preparation. Tofuyo is Okinawan fermented red tofu: firm Okinawan-style tofu (firmer and denser than mainland Japanese tofu due to traditional bittern use) is cured for 3–6 months in a mixture of Okinawan awamori (泡盛, a distilled rice spirit), red koji (beni-koji, 紅麹, red mold fermentation), and mirin or salt. The long fermentation produces a transformation as dramatic as the difference between fresh milk and aged cheese: tofuyo becomes deep red-orange in colour, extremely concentrated in umami amino acids (protease enzymes from the red koji break down tofu protein into free amino acids), soft to the point of almost spreadable, intensely savoury, and mildly alcoholic. Tofuyo is consumed in tiny quantities (the size of a fingertip) as an appetiser with awamori — its potency means more than a few pieces would overwhelm. Other notable regional tofu forms: Nagasaki's yuki-tofu (traditional island-style firm tofu); Niigata's zunda tofu (with edamame); Kyoto's karintofu (soft skin tofu used in kaiseki).

Tofuyo: intensely savoury, deeply umami, faintly alcoholic, smooth-spreadable; the flavour is often compared to aged blue cheese in its pungency and concentration; the red koji colour produces a vivid visual contrast to the tofu's original white