
Thickening a sauce or soup without reaching for cornstarch is easier than most people think, and arrowroot starch is one of the cleanest, most reliable ways to do it. This simple two-ingredient slurry comes together in seconds and delivers a beautifully glossy finish that makes gravies, broths, and pan sauces look genuinely restaurant-worthy. Because arrowroot is naturally derived from a root vegetable and processed on its own, it sidesteps the cross-contamination concerns that can come with nut-adjacent products at the grocery store. The technique is straightforward β whisk the starch into cold water first, then stir it into a gently simmering liquid β but the timing matters, so pulling the pan off the heat promptly keeps the texture silky rather than thin. It thickens quickly and sets to a light, glossy coat that won't cloud your sauce or leave a starchy aftertaste. Keep this ratio in your back pocket and you'll never be caught with a watery stew again.
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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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