If you're after something for the kitchen or dining room table, head to Kappabashi-dōri Japan’s largest wholesale restaurant-supply and kitchenware district. Gourmet accessories include bamboo steamer baskets, lacquer trays, neon signs and chōchin (paper lanterns). It's also where restaurants get their freakishly realistic plastic food models.
If you'd like to buy some plastic food as a souvenir, head to Ganso Shokuhin Sample-ya. For fine Japanese-crafted knives and other classic pieces of kitchen equipment, Kama-asa is an ideal choice.