Ezawa

Katsuura tantanmen is not Sichuan tantanmen and does not pretend to be. There is no sesame paste and no peanut. It is a soy-based chicken, pork and seafood broth with a thick layer of house-made chilli oil on top, minced pork, and — the detail that makes it — chopped onion cooked down until sweet. It was invented at this shop in the 1950s by a cook who took the idea of Sichuan dry tantanmen and put it into his own shoyu ramen, and it caught on because fishermen and ama divers coming out of cold water wanted something that would warm them from the inside.

The chilli oil is red enough to be startling and the heat is real but not punishing; the onion is why. It is out in the hills above the town rather than in the port, opens at half past eleven, closes when the soup runs out, and takes Mondays off. There is normally a queue.

The dish sits at an odd crossroads of influences, and that is part of what makes it distinct from the wider tantanmen boom that later spread across Japan borrowing more directly from Sichuan cooking. Rather than importing sesame paste, ground peanut, or the numbing Sichuan pepper that define the dish on the mainland, the original cook kept his base firmly in the shoyu ramen tradition he already knew and simply borrowed the idea of a chilli-oil topping, then adapted it to what was actually available and useful to fishermen coming off cold boats — animal fat, sweetness, and heat, rather than the layered aromatics of the source dish. That practical, improvised logic is why the onion matters as much as the chilli: it was never meant to evoke Sichuan cuisine so much as to solve a specific, local problem of getting warmth and calories into someone quickly after hours in cold water. Decades on, the dish has become enough of a point of civic identity that the city promotes it formally, but the shops that still do it best remain small, family-run counters rather than anything resembling a chain.