Chiba Seafood and Tokyo Bay Access Cuisine
Chiba Prefecture — Boso Peninsula and Tokyo Bay coastal tradition
Chiba Prefecture wraps around the eastern shore of Tokyo Bay and extends into the Pacific, giving it a double seafood identity: calm bay waters producing hamaguri (surf clams), asari (short-necked clams), and hazefish on one side; Pacific Ocean access producing saba (mackerel), iwashi (sardines), and katsuofish on the other. The city of Choshi in northern Chiba is one of Japan's most important fishing ports (historically in the top three by landed volume) and has shaped Japanese seafood culture: Choshi is the origin of Yamasa soy sauce (the factory's proximity to the fishing port ensured fresh katsuobushi supply for soy sauce seasoning development) and Iinuma Jozo's soy sauce production heritage. The asari clam culture of Chiba is centred on the still-operational tidal flats (higata) of Tokyo Bay at Funabashipaiku and Urayasu — asari digging (shiohigari, tide-flat foraging) at low tide is one of Japan's most popular seasonal family activities. Clam cooking techniques specific to Chiba: hamaguri su-miso ae (steamed surf clam with vinegar miso dressing), asari sakamushi (clams steamed with sake and spring onion), and asari gohan (clam rice). Namero (also strongly associated with Boso Peninsula in Chiba) is a fishermen's dish of finely minced fresh sashimi-grade fish (aji, saba, or iwashi) pounded with miso, ginger, shiso, and scallion into a rough paste — eaten raw on rice or toasted into sangayaki.