
Thickening a sauce or soup sounds simple until you realize most go-to options can quietly cause problems for people managing a red meat allergy β cornstarch is usually fine, but plenty of packaged gravies and roux-based thickeners hide mammal-derived ingredients you'd never expect. Arrowroot starch is a clean, plant-based alternative that sidesteps those concerns entirely, making it a genuinely useful pantry staple. Just two ingredients β arrowroot starch and cold water β come together in seconds to create a silky slurry that transforms any simmering broth, sauce, or soup into something glossy and beautifully coated. The technique is straightforward: whisk until smooth, stir once more before adding, then pour it into your simmering liquid while keeping things moving. The result is a light, elegant thickness that doesn't cloud or dull the flavor of whatever you're cooking. The one thing to keep in mind is that arrowroot doesn't love prolonged high heat, so pulling the pan off the burner right after it thickens keeps everything looking and tasting exactly as it should.
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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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