Using the best local ingredients, including local fish, is the focus of Fin, an upscale restaurant in a historic house in the Theater Marketplace, a short walk from the Cape Cinema, Cape Playhouse (p. ###), and Cape Museum of Art. Food is on the rich side and very good. You’ll want to have an appetite to eat the likes of foie gras crème brûlée. Among the main courses, there are surprises: The seared peppered yellow-fin tuna comes with a soy-peanut dressing and cucumber-cilantro relish; the poached salmon comes with black-truffle butter.