How to beat egg whites (Slideshow version)
Stage 1/2 : 5 min.
They should be beaten at high speed.If they are for savoury or neutral preparations (i.e. without sugar), add a teaspoon of lemon juice before starting to beat to prevent them "going grainy" which can happen with very fresh egg whites.
If they are for sweet preparations (for meringues for example), incorporate 2 tablespoons of caster sugar from the total sugar you plan to add, halfway through beating, which makes it much easier to beat and to incorporate the remaining sugar.