In a microwave or a double boiler, heat chocolate, 1/4 cup of the water and butter until the chocolate and butter are melted. Cool for 10 minutes.
In a small heavy saucepan, whisk egg yolks, sugar and remaining 1/4 cup water. Cook and stir over low heat until mixture reaches 70C (160F), about 1-2 minutes. If you don’t own a thermometer, just cook for the time stated – it should be hot (but not simmering) and thick enough to coat the back of a metal spoon or spatula.
Remove from the heat; whisk in chocolate mixture. Set saucepan in a bowl of cold water and stir until cooled, about 5-10 minutes.
Fold in whipped cream. Spoon into dessert dishes. Refrigerate for 4 hours or overnight.
Keyword Chocolate Mousse, Mousse
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