How to cook
Pour the coffee and crushed chocolate in a container in a hot water bath.
Stir until dissolved and add the egg yolks and rum, while continuously beating.
Beat the egg whites to hard snow, pour the cream in and stir until the mixture hardens.
Add the white to the cooled chocolate mixture and stir.
Pour this cream into Champagne glasses, or suitable bowls and decorate with crushed hazelnuts, if desired.