Okonomiyaki evolved from issen yoshoku (one-coin Western-style food) street crepes of the Meiji era; the Osaka format solidified in the 1930s; the Hiroshima format developed independently in the post-WWII period (1940s–50s) from the need to stretch scarce ingredients — the layered technique allowed less batter to be used while creating a substantial meal from noodles and vegetables; Hiroshima's Okonomi-mura (Okonomiyaki Village, 6-story building of dedicated okonomiyaki shops) is the pilgrimage site for the Hiroshima style
Okonomiyaki (お好み焼き — 'grill what you like') exists in two fundamentally different forms that represent entirely separate techniques and philosophies despite sharing a name. Osaka-style (kansai-fuu): all ingredients are mixed into the batter simultaneously — finely shredded cabbage (a mountain of it, approximately 200g per portion), eggs, pork belly strips, shrimp, squid, tenkasu (tempura scraps), agedama, and dashi-enriched flour — then poured as a unified mass onto the iron griddle (teppan). The cook shapes and cooks both sides in a round cake. Hiroshima-style (hiroshima-fuu): completely different construction technique — a thin crepe-like batter layer is poured first, then raw cabbage is piled on top, then sliced pork belly, then bean sprouts are added on top; the stack is pressed, flipped, and cooked; separately, yakisoba noodles are cooked on the griddle, then the stack is placed on top of the noodles; a fried egg is slid under the whole construction and the okonomiyaki is inverted onto it as the final layer. The result is a multi-layered construction with entirely different texture from the Osaka version. Neither style is 'correct' — they are independent culinary traditions. Toppings for both: okonomiyaki sauce (Worcestershire-based, similar to tonkatsu sauce), Kewpie mayonnaise in zigzag, aonori, katsuobushi.
The texture contrast between the two styles creates fundamentally different eating experiences: Osaka okonomiyaki is springy and uniform throughout, the cabbage steaming within the batter; Hiroshima okonomiyaki has crisp-fried egg at the base, meaty pork belly in the middle strata, and soft cabbage at the top — each layer is a different temperature and texture; the cross-section slice reveals the construction like geological strata and presents multiple flavour zones in a single bite
Osaka style: mixed batter, uniform texture throughout; Hiroshima style: layered construction with distinct strata visible in cross-section; Hiroshima requires a wide flat spatula (hera) to manage the large, layered construction; both use the teppan at approximately 180°C; katsuobushi is applied as a final topping and dances from the heat — this is an aesthetic signal of correct serving temperature.
Osaka technique for maximum lightness: separate the egg white, beat to soft peaks, fold into the batter last — produces an exceptionally light, airy okonomiyaki; the cabbage-to-batter ratio should be 2:1 by weight (far more cabbage than batter — the cabbage provides structure); press the okonomiyaki firmly after both sides are cooked (not during) to compact slightly; the highest-quality Osaka okonomiyaki shows visible threads of melted nagaimo (mountain yam) in the batter — grated nagaimo added to the batter creates additional lightness and binding from its mucilaginous character.
Attempting Hiroshima construction technique with Osaka batter (incompatible — Osaka batter has too much egg to hold layered shape); pressing Osaka okonomiyaki too hard during cooking (compresses the cabbage and destroys the light texture); flipping before the exterior sets (tears the okonomiyaki); using wrong sauce (tonkatsu sauce can substitute but lacks the specific sweetness of dedicated okonomiyaki sauce).
Ono, Tadashi — Japanese Soul Cooking; Hachisu, Nancy Singleton — Japanese Farm Food