Yeast dough: Sieve the flour into a mixing bowl and mix carefully with the yeast. Add the remaining ingredients and mix with a hand mixer (dough hook) briefly on the lowest setting, then work on the highest setting for about 5 minutes to form a smooth dough. Cover the dough and let it rise in a warm place until it has visibly enlarged.
Topping 1: Mix the poppy seed cake with the crème fraîche, flavor and vanilla sugar.
Topping 2: Mix the mascarpone, eggs, sugar and flavor.
Topping 3: Drain the apricots in a colander, cut the halves in half. Wash, drain, pit and quarter fresh fruit.
Knead the dough briefly again on a lightly floured work surface and roll out into a rectangle (35 x 28 cm). Place the dough on a baking tray and press lightly. First distribute topping 1 with 2 tablespoons in portions on the dough. Put the covering 2 in the gaps. Distribute the apricot quarters decoratively on the topping. Let the cake rise in a warm place for 20 minutes.
Streusel: Sieve the flour into a bowl, add the remaining ingredients and use the hand mixer (dough hook) to make streusel. Spread the streusel on the cake and bake at top / bottom heat about 180 ° C (preheated), hot air about 160 ° C (preheated) or gas for about level 3 for about 35 minutes.