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Arrowroot powder is a white, flavorless starch extracted from tropical tubers. It's used as a gluten-free thickener for soups and sauces.| The Spruce Eats
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Cornstarch is a gluten-free thickening agent that is added to sauces, gravies, and desserts. To gelatinize the food, it must come to a full boil first.| The Spruce Eats