
Thickening a sauce or soup without relying on nut-based products is easier than most people think, and this two-ingredient slurry proves it beautifully. Arrowroot starch and cold water are all you need to transform a thin broth or pan sauce into something glossy, silky, and restaurant-worthy. The technique is straightforward β whisk the starch into cold water until completely smooth, then stir it into your simmering liquid and watch the magic happen in under a minute. One thing worth knowing: arrowroot is sensitive to high heat, so pulling the pan off the burner as soon as the liquid thickens is the key to keeping that gorgeous, light coating consistency. The result is a clean, neutral finish that won't cloud your sauce or add any competing flavor. It's a genuinely useful kitchen skill that works across soups, gravies, stir-fry sauces, and more β and it comes together with almost no effort at all.
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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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