A very chocolate dessert.
Melt chocolate and butter in a water bath, stirring. Beat egg whites with a pinch of salt until stiff.
Add sugar to chocolate, mix well.
Pour the chocolate into a large bowl and fold in the egg whites in 2 batches, mixing gently. Divide the mousse into molds and refrigerate for at least 20 minutes.
Sprinkle mousse with chopped nuts. Enjoy your meal!