Soak gelatine in cold water. Mix cappuccino powder and 2 tablespoons of hot water. Stir in a sheet of gelatine and let it cool down. Break the chocolate into pieces. Melt with 2 tablespoons of cream and rum while stirring on a hot water bath.
Beat the egg and egg yolk on a bain-marie until frothy. First stir in the remaining gelatine, then the chocolate. Leave to cool. Whip cream until stiff and fold in. Remove 1/3 of the mixture.
Stir the cappuccino powder into the rest. Rinse 4 cups with cold water. Fill up to half with the cappuccino cream and allow to set a little. Pour the white cream into a piping bag with perforated spout and squirt into the dark cream.
Add the rest of the cappuccino cream and leave to set in the refrigerator for approx. 2 hours. Put the raspberries and juice into a tall mixing bowl and puree. Use a sharp knife to remove the mousse from the rim of the cup.
Hold cups briefly in hot water and tumble them over. Arrange mousse with some sauce on plates. Peel off the chocolate with a peeler. Sprinkle over the dessert. Decorate as you like with icing sugar, cocoa and mint leaves.