Mile High Coconut Cream Meringue Pie
Credit: Gooseberry Patch

What does cream of tartar do when whipping egg whites?

A pinch of cream of tartar added when you are whipping egg whites helps the egg whites keep their volume longer. That means, among other things, meringues will be less weepy and less likely to deflate.

For more tips, see our video How to Beat Egg Whites.