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南蛮漬け (なんばんづけ, Nanbanzuke) is Nanbanzuke — a Japanese food (pickled salted or fermented).
What is Nanbanzuke?
Nanbanzuke is a fish dish. To prepare it, the fish, often aji ( Trachurus japonicus or a related species) or wakasagi (a smelt, Hypomesus nipponensis ), is first fried, then marinated in vinegar and other ingredients.