
Thickening a sauce or soup without reaching for cornstarch or a spice-laden seasoning packet is easier than most people think, and this two-ingredient slurry is proof. Arrowroot starch and cold water are all you need to transform a thin broth or pan sauce into something glossy, silky, and satisfying. Because arrowroot is naturally neutral in flavor, it won't introduce any heat, bitterness, or unexpected taste β making it a genuinely reliable choice when you need to keep things completely mild. The technique is straightforward: whisk the starch into cold water until smooth, then stir it into your simmering liquid and watch it thicken in under a minute. The key is pulling the pot off the heat promptly, since arrowroot is sensitive to prolonged high heat and will thin back out if you push it too far. Once you get the hang of that timing, you'll find yourself reaching for this method every time a soup or sauce needs a little body without any added complexity.
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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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