Wash the lemons, grate dry and finely grate the peel. Cream 500 g butter, sugar and vanilla sugar with the whisk of the hand mixer. Stir in the eggs one by one. Mix 150 g flour, ground hazelnuts, starch, 3/4 of the lemon rind, 1 pinch of salt and baking powder and stir in
Put the dough on a greased baking tray sprinkled with flour and spread it. Melt 125 g butter in a saucepan. Mix 150 g flour, brown sugar, hazelnut flakes, remaining lemon peel and 1 pinch of salt in a bowl. Add hot butter at once and knead into crumbles first with the dough hooks of the hand mixer, then briefly with your hands
Wash, clean and halve peaches, remove stones and cut peach halves into pieces. Sort blackberries. Spread the peach pieces and blackberries on the cake, sprinkle with crumbles and bake in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 45 minutes until golden brown
Remove the cake from the oven and let it cool down on a cake rack. Dust with icing sugar before serving
waiting time 1 1/2 hours