
Thickening a sauce or soup without reaching for cornstarch or a nut-based ingredient is easier than most people realize, and this two-ingredient slurry proves it beautifully. Arrowroot starch whisked into cold water creates a silky, lump-free mixture that blends seamlessly into simmering liquids, giving sauces and broths a gorgeous glossy finish. The technique is straightforward β stir the slurry back together right before you pour it in, keep the heat at a gentle simmer, and pull the pan off the burner as soon as things thicken up. That last step matters more than you might expect, because arrowroot is sensitive to prolonged high heat and will lose its magic if you let it boil hard. The result is a light, coating consistency that looks polished and restaurant-worthy without any complicated steps. It works beautifully in everything from pan sauces to Asian-inspired broths, and since the ingredient list is just starch and water, there is zero guesswork about what is actually going into your food.
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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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