Warm 100 ml of milk lukewarm. Put 500 g flour in a bowl and press a depression in the middle. Crumble yeast into it, mix with some flour from the edge, 25 g sugar and lukewarm milk. Cover and let it rest in a warm place for about 15 minutes. Melt 100 g fat, add 150 ml milk. The milk-fat mixture should be lukewarm.
Add 50 g sugar, egg, salt and milk-fat mixture to the flour rim. Knead everything into a smooth dough with the dough hooks of the hand mixer. Cover and leave to rise in a warm place for about 30 minutes. For the crumble dough melt 150 g fat. Mix 300 g flour, 125 g sugar and vanillin sugar in a bowl. Add the fat and knead into crumbles with the dough hook of the hand mixer. Wash, halve and stone the plums. Grease the fat pan of the oven (approx. 32 x 38 cm) well. Roll out the dough on a floured work surface to the size of the fat pan. Place the dough sheet in the fat pan. Spread the plums on it like roof tiles, sprinkle with 25 g sugar and the crumbles. Cover and leave to rise again for about 10 minutes.
Grease the fat pan of the oven (approx. 32 x 38 cm) well. Roll out the dough on a floured work surface to the size of the fat pan. Place the dough sheet in the fat pan. Spread the plums on it like roof tiles, sprinkle with 25 g sugar and the crumbles. Cover and leave to rise again for about 10 minutes. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 30-35 minutes. Let them cool down. Cinnamon cream tastes good with it
waiting time approx. 1 1/2 hours