It's Kosher for Passover so I made it for tonight's seder at my folks' house. And it's easy! I left Neeracha's translation notes in; it makes for funny reading.
Ronald's Recette Mousse au Chocolate
Dissolve with a bain-marie 250 G of dark chocolate.
Add 100 G of butter, & mix until consistency of smooth and homogeneous pomade (Uhhh...okay-strange analogy).
Mix until you have a creamy texture. Add 4 egg yolks out of fire (probably not meant to be taken literally - this is where I'm a bit confused) and mix delicately.
Mix 6 egg whites to the consistency of firm snow, while mixing in 40 G of sugar.
Gradually pour the chocolate on the egg white mixture, while stirring delicately using a small skimmer.
Draw up foam in a salad bowl or ramekins. (I'm assuming that draw up foam means that one should pour the mousse into a bowl.)
Chill in the refrigerator at least 2 hours. Serve with whipped cream.