
Thickening a sauce or soup without reaching for cornstarch or a roux is easier than most people think, and this two-ingredient slurry proves it. Arrowroot starch whisked with cold water creates a silky, lump-free mixture that blends seamlessly into simmering liquids, giving you that glossy, restaurant-quality finish at home. It works beautifully in everything from gravies to broths to fruit sauces, and the result is noticeably cleaner and lighter than heavier thickeners. For anyone navigating nut allergies or sensitivities, this approach is refreshingly straightforward β just two pantry staples, no hidden additives, no cross-contamination concerns from complex blends. The one trick worth remembering is timing: once the liquid turns glossy and coats the back of a spoon, pull it off the heat right away, since arrowroot loses its magic if it boils too long. Master this quick technique and you'll have a reliable finishing move for almost any dish on your stovetop.
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Combine the arrowroot starch and cold water in a small bowl and whisk or stir with a fork until completely smooth with no lumps remaining.
Bring the liquid you want to thicken (sauce, soup, or broth) to a gentle simmer in a saucepan over medium heat.
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