
Thickening a sauce without reaching for cornstarch or a commercial thickener is easier than most people think, and arrowroot starch is the quiet hero that makes it happen. Many store-bought thickeners and sauce mixes sneak in emulsifiers like mono- and diglycerides or lecithin, which can be a real headache when you're trying to keep things clean. This two-ingredient slurry sidesteps all of that β just arrowroot starch and cold water, whisked smooth and stirred into whatever you're cooking. The result is a beautifully glossy finish on soups, sauces, and broths that looks like it took serious technique. The key is keeping the heat gentle and pulling the pan off as soon as things thicken up, since arrowroot is a little more delicate than other starches at high temperatures. Once you get the hang of it, you'll find yourself reaching for this method every time a recipe needs a little body.
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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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