Arrowroot powder is a white, flavourless powder used to thicken sauces, soups, and other foods. Arrowroot powder is comprised of starches extracted from various tropical tubers, such as the arrowroot plant and cassava. Some lower quality arrowroot powder blends may also contain potato starch, so be sure to read ingredient lists carefully. Arrowroot powder has twice the thickening power of wheat flour and because it contains no protein, arrowroot is gluten-free. Unlike cornstarch, arrowroot powder creates a perfectly clear gel and does not break down when combined with acidic ingredients like fruit juice. Arrowroot also stands up to freezing whereas mixtures thickened with cornstarch tend to break down after freezing and thawing.