Tofu is a common stir-fry staple, made from soybeans that have been pressed into a block. It is a popular ingredient in many Asian dishes, as it is high in protein and low in fat. Tofu is also versatile, as it can be cooked in a variety of ways, including stir-frying, baking, grilling, and boiling. It is a great source of calcium and iron, and can be used as a meat substitute in vegetarian dishes.