Beat the fat, sugar, vanillin sugar and lemon zest with the whisk of the hand mixer until foamy. Stir in the eggs bit by bit. Add liqueur. Mix flour, cornstarch and baking powder and stir in.
Fold in almonds and raisins. Pour the dough into a well greased, breadcrumbed box form (30 cm long). Bake in a preheated oven (electric: 175 °C/ gas: level 2) for about 80 minutes.
Take the cake out of the oven and let it cool down on a grid. Turn out of the mould. Dust with icing sugar. Makes about 24 pieces.