24 1 pound boxes of Argo Corn Starch A nearly flavorless thickener, Argo's corn starch allows the natural flavor of the food to come through and has been a trusted name in corn starch for over a century. Corn starch can be used as a thickener for smooth gravies, sauces, glazes and casseroles. It is also a foolproof thickener in pies, puddings, custards and cake fillings. It is also gluten-free, making it the perfect substitute in cooking and baking when flour and other glutinous starches must be avoided.