For a perfect sauce every time, closely follow the recipe directions and remember these tips.
Prevent lumps in cornstarch or flour-thickened sauces by stirring constantly. If lumps do form, heat the sauce briskly with a wire whisk or a rotary beater.
Cook sauces over low to medium heat unless the recipe says otherwise. And cook your sauces no longer that the time specified. High heat and lengthy cooking can cause sauces to curdle or break down.
If you have to leave the sauce while it’s cooking remove it from the heat.