Pour the egg whites into a bowl and add a pinch of salt.
Beat the eggs until they are very firm.
Gradually pour the chocolate over the egg yolks, stirring vigorously.
Add 1/3 of the whisked egg whites to the mixture, then gradually add the rest of the egg whites while turning the bowl up and down to distribute the chocolate without dropping the whites.
Leave to cool for at least 3 hours in the fridge.
You can now enjoy your delicious chcolat mousse very cold.