Stir pudding powder, sugar and advocaat until smooth. Bring milk to the boil and stir in the pudding powder. Bring to the boil again. Let it cool down a little while stirring, fold in chocolate drops. Put the pudding into four coldly rinsed pudding moulds and leave to set for about 3 hours.
For the sauce, place the cherries on a sieve, collecting the juice. Stir 4 tablespoons of juice and starch until smooth. Boil up the rest of the juice, vanilla sugar and lemon zest. Stir in the mixed starch, bring to the boil once and let it swell at low heat for about 5 minutes. Add the cherries and let it cool down. Stir several times in between. Remove lemon peel. Use a sharp knife to remove the pudding from the edge of the mould and turn each one out onto a dessert plate. Sprinkle with brittle.
Stir several times in between. Remove lemon peel. Use a sharp knife to remove the pudding from the edge of the mould and turn each one out onto a dessert plate. Sprinkle with brittle. Add the sauce. Decorate with lemon balm leaves if desired