Cornstarch is a white, chalky powder made from the endosperm found at the center of the corn kernel. It has several culinary uses due to its high starch content: -As a thickening agent for soups, sauces, and stews. -For crispy coatings instead of flour or breadcrumbs. Use for crispy tofu or veggies. It can be omitted from the recipe entirely, but the tofu will be softer in texture.