Pour 400 g of flour into a bowl and press a depression in the middle. Warm 100 ml milk and 1 tablespoon sugar lukewarm. Crumble yeast into it and dissolve it. Pour it into the hollow and mix it with some of the flour to the pre-dough.
Cover and leave to rise in a warm place for about 15 minutes.
Warm the rest of the milk lukewarm and add 75 g sugar, 1 pinch of salt, 1 egg and 60 g fat in flakes to the pre-dough. Knead everything with the dough hooks of the hand mixer for about 2 minutes until smooth. Cover and leave to rise in a warm place for about 45 minutes.
Grease the fat pan (approx. 32 x 39 cm; approx. 3.5 cm deep). Wash, de-stem, halve and stone plums. Coarsely grate the marzipan and fill into a bowl. Stir in 7 eggs individually. Stir in sour cream, flavour, 75 g sugar, vanilla sugar and almonds bit by bit.
Knead the yeast dough again briefly, dust with flour and press it onto the fat pan with your hands as a base, pressing it up slightly at the edges. Spread plums on top. Pour marzipan icing on top. Bake in the preheated oven (electric cooker: 200°C/circulating air: 175°C/gas: level 3) for about 40 minutes.
Let it cool down. Sweetened sour cream with a little sugar tastes good with it.