Melt 100 g butter, leave to cool. Mix the low-fat quark with 1 tablespoon of sugar and the vanilla sugar. Stir in the flour by spoonfuls. Let it rest for about 20 minutes.
For the sauce:
Bring the cherry nectar to the boil with 4 tablespoons of sugar. Mix the cornstarch with approx. 3 tablespoons of water until smooth. Bind nectar with it. Add the berry cocktail.
For the dumplings:
Shape approx. 20 dumplings out of the quark mixture with moistened hands and turn in a little flour. Let simmer in boiling salted water for about 5 minutes. Lifting out. Heat 2 tablespoons of butter and toast the poppy seeds in it. Turn the dumplings in it. Serve with sauce.