Crumble Kemm cake. Cream fat in a bowl. Stir in sugar and vanillin sugar. Add eggs bit by bit. Mix flour and baking powder and stir in. Add advocaat and fold in Kemm`sche cake.
Pour the dough into a greased pancake tin (3 litres capacity) sprinkled with breadcrumbs and bake in a preheated oven (electric range: 175°C/ gas: level 2) for approx. 60 minutes. Let the cake cool down on a grid, turn out of the tin, prick several times with a wooden stick and sprinkle with 4 tablespoons of orange juice.
Mix icing sugar and remaining orange juice, place on the cake and sprinkle with pistachios. Serve as desired, decorated with candied orange slices and lemon balm leaves.