Warm 300 ml of milk lukewarm. Crumble yeast into it and dissolve it. Mix 600 g flour, 100 g sugar and 1 pinch of salt. Add yeast milk, egg and 100 g butter and work into a smooth dough using the dough hooks.
Cover and leave to rise in a warm place for about 45 minutes.
Take 10 tablespoons of 1 l milk and mix with sauce powder and 4 tablespoons of sugar. Boil up the rest of the milk, stir in the sauce powder and simmer for about 1 minute. Let sauce cool down, stirring from time to time.
Wash the plums, cut them in half and remove the stone. Fill each with an almond and close again.
Knead the dough onto some flour. Divide into 3 equal pieces, form each into a roll and cut into 6 slices each. Cover each slice with 1 plum and form into a ball with floured hands.
Place them side by side in a greased ovenproof dish. Cover and leave to rise in a warm place for about 30 minutes. 1⁄4 l milk, 5 tablespoons sugar and 50 g butter lukewarm and pour over the risen balls.
Bake in the preheated oven (electric oven: 200 °C/ convection oven: 175 °C/gas: level 3) for approx. 40 minutes (cover the last 15 minutes if necessary). Remove the pasta and sprinkle with 1 tbsp. sugar.
Add the vanilla sauce.