Warm up the milk. Crumble yeast into it, dissolve in it. Put the flour in a bowl and press a depression into it. Add milk and 1 tbsp. sugar, mix with some flour. Cover and leave to rise in a warm place for about 15 minutes.
Melt 50 g butter, let it cool down a little. Add ##egg##, 1/2 tsp salt and 1 tbsp sugar to the flour. Knead with the dough hooks of the hand mixer, then with your hands to a smooth dough.
Cover and leave to rise for about 30 minutes.
Knead the dough again. Divide into 4 equally sized pieces and press each one slightly flat. Place 1 tbsp. ##plums##mus in the middle of each piece. Press the dough well together and form into dumplings.
Place the dumplings on a floured tray with the seam facing downwards. Leave to rise for 20 minutes. Bring 150 ml salted water to the boil in a saucepan with a steam insert. Place 2 dumplings in the steamer basket.
Steam the dumplings in two portions covered at low heat for about 20 minutes. Prick the finished dumplings with a skewer so that the steam escapes. Remove the dumplings and keep warm.
Melt 100 g butter. Stir in the poppy seeds and roast for about 1 minute while stirring. Arrange dumplings on plates. Cover with poppy seed butter and dust with icing sugar.