Why Use Reserved Pasta Water
A lot of pasta recipes call for using reserved pasta water in your sauce. The reserved water they’re talking about is the water you used to cook the pasta. That white and slightly white cooking liquid contains starch that comes from the pasta when cooking. That starchy water can be used later to adjust the thickness of the sauce you’re making.
The reserved pasta cooking water has more body and flavor than using straight water.
And reserved pasta water isn’t just for tomato sauce. It can also be used in pesto or other pasta sauces just as effectively. Try it in this recipe for eggplant, pasta and fresh basil
Sometimes a pasta sauce will call for “reserved pasta water”. So you don’t forget to save it, place a measuring cup in the colander and when you pour your pasta out of the pan to drain, pour some of the water in the cup and set aside.