To make a teriyaki dish, ingredients are broiled, roasted, or grilled after being marinated in or basted by teriyaki sauce. It's the teriyaki sauce that brings the shiny look (teri) to the ingredients. You can buy teriyaki sauce in a bottle at the grocery store, but authentic teriyaki sauce is very easy to make. To make teriyaki sauce, basically soy sauce, mirin, and sugar are used. Although it's possible to substitute mirin with sake and sugar, the key ingredient in teriyaki sauce is mirin. Mirin adds luster to ingredients. Teriyaki sauce can be used for glazing and marinating meats and vegetables.