Pour the cherries onto a sieve, drain well and collect the juice. Stir 5 tablespoons of juice, 1 tablespoon of sugar and sauce powder until smooth. Pour the rest of the juice into a pot and bring to the boil. Add the sauce powder while stirring, fold in the cherries and set aside. Crumble the cake roughly.
Stir 5 tablespoons of milk, remaining sugar and pudding powder until smooth. Bring the remaining milk and cream to the boil. Add the pudding powder while stirring and bring to the boil again briefly. Put 1 tablespoon of cake crumbs aside for decoration, carefully fold the remaining cake crumbs into the pudding. Pour the stewed cherries and pudding into dessert glasses, sprinkle with the cake crumbs put aside and serve decorated with lemon balm as desired