Quick Tip: Thicken Sauces with Pasta Cooking Water

Emma Christensen
Emma Christensen
Emma is a former editor for The Kitchn and a graduate of the Cambridge School for Culinary Arts. She is the author of True Brews and Brew Better Beer. Check out her website for more cooking stories
updated May 2, 2019
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It feels counter-intuitive to add water to a sauce in order to thicken it, but this trick works! As any Italian home cook will tell you, just a little starchy cooking water gives the sauce extra body and an almost creamy mouthfeel. Have you ever tried this?

All we do is dip out about a half a cup of the cooking water just before draining the pasta. It will look cloudy and yellowish from the starch. Stir this into your simmering sauce a few tablespoons at a time. The sauce will thin out a little and then thicken as the starchy water is absorbed.

This is less dramatic than adding cornstarch to a sauce or soup, but it works to bring the sauce together and make it silky. It works best with non-dairy sauces like tomato sauce, or with sauce-less pasta dishes like spaghetti carbonara or aglio e olio (pasta tossed with garlic and olive oil).

Give this a try next time you make a pasta sauce!

(Image: Flickr member FotoosVanRobin licensed under Creative Commons)