Put yeast and 1 tablespoon of sugar in a small bowl and stir until the yeast is liquid. Melt 75 g fat in a saucepan and add the cold milk. Put flour, 60 g sugar, salt and 1 egg in a bowl. Add yeast and lukewarm fat-milk mixture and knead with the dough hooks of the hand mixer to a smooth yeast dough. Cover and leave to rise in a warm place for 30-45 minutes. Grease a fat pan (approx. 39 x 32 cm) and dust with flour. Knead the yeast dough on a floured work surface and roll it out in the fat pan.
Cover and leave to rise in a warm place for 20-30 minutes. Select the blueberries, wash and drain well. Mix the sour cream, 4 eggs and 100 g sugar, stir in the pudding powder. Spread blueberries on the yeast dough and pour the sour cream vanilla icing over it. Sprinkle with almond slivers and 100 g sugar and spread 50 g fat in flakes on top. Bake in the preheated oven on the middle shelf (electric oven: 200 °C/ convection oven: 175 °C/ gas: level 3) for 35-40 minutes. Allow to cool on the fat pan
1 hour waiting time