For the pudding, mix pudding powder with 3 tablespoons of sugar in a bowl. Stir with 100 ml milk until smooth. Heat 500 ml milk in a pot, bring to the boil. Remove from heat and stir in the pudding powder. Bring to the boil while stirring, simmer for about 1 minute. Pour the pudding into a bowl, cover with foil and let it cool down lukewarm
Grease the fat pan of the oven (32 x 39 cm) and dust with flour. Cream 500 g butter, 400 g sugar and vanilla sugar with the whisk of the hand mixer. Stir in eggs one after the other. Mix flour, baking powder and cocoa. Sieve onto the fat cream and stir in
Put the dough into the fat pan and smooth it down. Press densely into the dough. Distribute approx. 1 tsp. pudding and 75 g butter in flakes in each of the hollows. Cover the rest of the pudding and put aside
Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 40 minutes. Mix sour cream with icing sugar. Take the cake out of the oven and put the rest of the pudding into the bowls. Spread the frosting over the cake and bake at the same temperature for another 10 minutes. Remove the cake and let it cool down. Red fruit jelly tastes good with it
waiting time approx. 3 hours