Stir pudding powder and 5 tablespoons grape juice until smooth. Boil up the rest of the juice. Stir in the pudding powder and simmer for 1-2 minutes.
Rinse 4 cups (each containing approx. 150 ml) with cold water. Pour in the flummery. Let it cool down first, then put it in a cool place for at least 3 hours.
Defrost the raspberries. Puree raspberries, pass through a sieve and mix with icing sugar.
Whip the cream until stiff, adding cream firming agent and vanillin sugar. Fold in raspberry puree in streaks.
Dip the cups briefly in hot water, turn the flummery onto plates and serve with a little raspberry cream. Add the rest. Decorate with mint.