Japan — Meiji Naval cuisine adoption of British curry; first civilian restaurant curry in Ginza, Tokyo approximately 1876; S&B curry powder commercialised 1905
Japanese curry (kare) is one of Japan's most-consumed dishes — a thick, deeply savoury, mildly sweet stew-like preparation with roots in the British Navy's interpretation of Indian curry introduced to Japan in the Meiji era. The Japanese Navy adopted curry as a high-protein, storable ration food in the 1870s, and the dish spread from military to civilian use, becoming a national staple by the Showa period. Japanese curry occupies a completely distinct flavour space from Indian or Thai curry: thicker consistency (achieved with roux), sweeter profile, less heat, and a depth of flavour built on caramelised onion, apple or honey for sweetness, garam masala-influenced spice blends, and often dark roux. The beloved S&B Golden Curry and Vermont Curry roux blocks defined the home-cooking version for generations.
Thick, mellow, sweet-savoury depth, aromatic spice warmth without sharp heat, caramelised onion sweetness, rich stew body
The foundation is deeply caramelised onion — 45–60 minutes over medium heat until mahogany-brown, sweeter than most cooks expect. The curry roux can be pre-made blocks (S&B, House Foods) or scratch-made by toasting flour in butter/oil before adding curry powder and other spices. Potato and carrot must be added at correct times to prevent disintegration. Grated apple or a tablespoon of honey is the traditional Japanese sweet balance. The 'secret ingredients' of professional katsu curry shops include dark chocolate (1 square), instant coffee, soy sauce, and mirin.
For katsu curry (the most popular restaurant version), fry the tonkatsu separately and add it at the last moment — never simmer the cutlet in the curry, which destroys the panko crust. Restaurant-quality Japanese curry uses multiple roux blocks of different spice intensities: mix medium and hot to create a custom profile. The dedicated curry shop culture in Japan values house-made roux developed over years — some Tokyo shops have maintained the same base recipe since the Showa period.
Under-caramelising the onion — the sweet depth of Japanese curry comes almost entirely from this step, and rushing it produces a thin, sharp curry. Using commercial roux blocks at room temperature rather than melting them into a small amount of hot liquid first, causing clumping. Adding vegetables too early, producing mushy texture. Skipping the resting step: Japanese curry is universally better the next day after the flavours have had time to meld.
Cwiertka, Katarzyna — Modern Japanese Cuisine; Ishige, Naomichi — The History and Culture of Japanese Food