Alfredo sauce thickens fast, both as it cooks and as it sits after cooking. If your sauce came out thicker than you wanted, or if leftovers have turned into a dense paste overnight in the fridge, here is how to bring it back.
The Best Options for Thinning
Reserved pasta water is the ideal choice. The starch in the water thins the sauce without diluting its flavor and actually helps the sauce cling to pasta. Always save a cup before draining.
Warm milk or cream are the best options after pasta water. They keep the sauce rich and do not change the flavor noticeably. Add them a tablespoon or two at a time over low heat, whisking as you go.
Plain water or broth work as a last resort but will dilute the flavor slightly. Use broth rather than plain water if you have it, and add a small pinch of salt to compensate for what gets diluted.
How to Thin It Without Breaking the Sauce
- Keep the heat on low, never add cold liquid to a sauce over high heat.
- Add the liquid slowly, a tablespoon or two at a time.
- Whisk continuously after each addition, let it fully incorporate before adding more.
- Stop when you reach the consistency you want, it is easy to add more but you cannot take it out.
Thinning Sauce When Reheating
Leftover Alfredo sauce will almost always need to be thinned when reheated. See our how to reheat Alfredo sauce page for the full method, including exactly how much liquid to add and at what heat setting.
Preventing It From Getting Too Thick in the First Place
Alfredo sauce thickens as it sits, even off the heat. Serve it immediately after tossing with pasta rather than letting it wait. If you need to hold the sauce for a few minutes before serving, keep it over the lowest possible heat with a lid slightly ajar, and stir in a small splash of pasta water just before serving.