How to make fruit dumplings (traditional Czech delicacy)

Traditional way to prepare dumplings filled with fruit (apricot, strawberry, plums, cherries, etc.). You can also substitute fruit with jam.
This video shows how to make strawberry dumplings with curd cheese topping but you can also use poppy seeds, or cocoa powder to sprinkle over the top.
Fruit dumplings are usually eaten as a main being rather filling.
You will need:
350 flour (plain flour or white whole wheat flour)
20 g fresh yeast
250 ml lukewarm milk
2 tsp icing sugar (powdered sugar)
2 tbs melted butter
2 yolks
2 pinch salt
about 1/2 kg fruit of your choice
For the topping:
200 g quark (curd cheese)
powdered sugar
80 g melted butter (to pour over the topping)