Guar gum is available in a fine, off-white color powder. As with tapioca and cornstarch, it is used in cooking for thickening, stabilizing, and emulsifying. It is a good alternative to tapioca flour, especially if you are preparing food to store in the freezer. Guar gum will act as a thickener while its inherent compounds prevent the formation of ice crystals during freezing. It is very powerful as a thickener and requires only a small amount to replace other thickeners. Start with adding a ¼ of a teaspoon to the pot and increase the amount slightly if it is not thick enough.