
Thickening a sauce or soup without cornstarch or store-bought blends can feel like a puzzle, especially when so many commercial thickeners sneak in unexpected additives. This two-ingredient slurry solves that problem cleanly, using nothing but arrowroot starch and cold water to create a silky, glossy finish in under a minute. Arrowroot is a naturally neutral starch, so it won't muddy the flavor of a delicate broth or overpower a carefully seasoned pan sauce. The technique is straightforward: whisk the starch into cold water until completely smooth, then stir it into your simmering liquid and watch it transform almost instantly. The key is pulling it off the heat as soon as it thickens β arrowroot is sensitive to prolonged high heat, so a quick 30 to 60 seconds is all you need. Once you get the hang of it, this little slurry becomes the quiet workhorse behind glossy gravies, velvety soups, and beautifully coated stir-fry sauces.
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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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