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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 great for thickening sauces and soups, but if you try to add it directly, you'll get lumps. You need to make something called a slurry.| The Spruce Eats