Tofu is a wonderful source of protein for vegetarians and offers a substitute for meat, chicken, and fish. While its extremely mild taste can make a dish quite bland, it also makes tofu the perfect ingredient for implementing a flavorful marinade. This tofu marinade made with rice vinegar, soy sauce, sesame oil, and chili paste does double duty as a marinade and a sauce. Pressing the tofu and then dry-frying before marinating removes all of the moisture, enabling the tofu to really soak up the flavors. The recipe is designed to have extra marinade to add to the stir-fry at the end to make a sauce.