Prepare all the ingredients.
Prepare a bain marie: bring a pot of water to a boiling point.
Meanwhile...
... the eggs one after the other. Keep the yolks aside for any other use.
Pour the egg whites in a mixing bowl.
Add the icing sugar...
...and mix.
Whisk the eggs to get a meringue.
To do this, go over the "Bain Marie" (simmering) and whisk.
The meringue goes up slowly.
When it is white and stiff...
...keep on beating with a hand mixer (out of the bain Marie) until fully cooled.
The meringue is ready for use. It can't wait. Use it immediately !!!