Knead quark, 50 g butter in flakes, flour, semolina, 2 egg yolks, 3 tablespoons sugar, 1 pinch salt and lemon zest to a smooth dough. Form the dough into a roll (approx. 12 cm long). Chill for about 2 hours.
Drain the cherries well.
For the vanilla sauce, stir 3 tablespoons of milk and starch until smooth. Stir in 1 egg yolk. Bring the remaining milk, vanilla sugar and 2 tbsp. sugar to the boil. Stir in the starch and simmer for about 1 minute. Let it cool down.
Cut the quark dough into about 12 slices. Cover each slice with 2-3 cherries and form into dumplings. Let them simmer in boiling salt water for about 20 minutes.
Roast breadcrumbs in a pan without fat,.
Add 1 tablespoon sugar and 2 tablespoons butter and melt. Remove the dumplings with a skimmer, roll them immediately in crumbs and serve with vanilla sauce.