
Thickening a sauce or soup without reaching for conventional starches or store-bought products is easier than most people expect, and this two-ingredient slurry proves it. Arrowroot starch and cold water are all you need to create a smooth, glossy finish that clings beautifully to broths, pan sauces, and soups. Many commercial thickeners and processed food additives β including certain gels and stabilizers derived from seaweed β can be a concern for people avoiding carrageenan, so making your own slurry from scratch puts you fully in control of what goes into your food. The technique is straightforward: whisk the starch into cold water until completely lump-free, then stir it into your simmering liquid and watch it transform in under a minute. The key is pulling the pot off the heat promptly, since arrowroot works best at a gentle simmer rather than a rolling boil. Once you get the hang of it, you'll find yourself reaching for this method every time a recipe calls for a thickened finish.
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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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