Sauté of golden cuttlefish; oyster risotto; seafood ragù – the wealth of fish dishes kindles the appetite. The secret to Osteria da K.’s superb seafood is its unusual pedigree: think of it as an Italian restaurant opened by a sushi chef and you’ll understand. Moreover, the chef is well-versed in the art of handling fish. The osteria-style à la carte dishes are simple, focused squarely on ingredients. Being a casual eatery in Ginza, it is crowded night after night.