
Thickening a sauce or soup without reaching for cornstarch or a spice-laden blend is easier than most people realize, and this two-ingredient slurry gets the job done beautifully. Arrowroot starch is a naturally neutral thickener, so it won't introduce any unwanted flavors or hidden seasonings into your dish β a real win when you're managing a spice sensitivity and need to trust every single component on the label. The technique is straightforward: whisk the starch with cold water until completely smooth, then stir it into your simmering liquid and watch it transform into something glossy and perfectly coated within about a minute. One thing to keep in mind is that arrowroot is a bit more delicate than some other thickeners β pull the pan off the heat as soon as you hit that silky consistency, because prolonged boiling will break it down and thin the sauce right back out. Whether you're finishing a savory broth, a pan sauce, or a light gravy, this slurry gives you clean, reliable results with nothing extra sneaking in.
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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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