Melt the chocolate in a large mixing bowl over hot water or in the microwave in 30-second bursts.For detailed instructions see How to Melt Chocolate
When the chocolate is almost melted, remove from the heat and stir until it's all melted
Separate the eggs, being careful not to allow any of the yolk into the whites (or they won't whisk up)
Put the yolks into a small bowl or cup. Put the whites into a medium bowl for whisking
Whisk the egg whites into soft peaks.The tips will fall over onto themselves
Use an electric hand-whisk or a balloon whisk, add the sugar, and whisk again briefly
Stir the egg yolks quickly into the melted chocolate
Whisk in a third of the egg white/sugar
Fold the rest of the egg white very gently into the chocolate mixture with a metal spoon until just combined (be careful not to overmix).The idea is to keep as much air as possible in the mousse
Put into bowls and refrigerate for at least four hours until set
Decorate with cream if liked.
Video
Notes
Everyday Cooks Tips:
Variations:
Add a tablespoon (15ml) brandy after the egg yolks