How to beat egg whites (Slideshow version)
Stage 1/2 : 5 min.
Whisk at high speed.You can add a teaspoon of lemon juice before you start beating to prevent them from "graining" (forming small grains), which can happen with very fresh egg whites.
If the egg whites are to be sweetened (for meringues, for example), add 2 tablespoons of the sugar halfway through the whipping, to support them and help them rise.