Select the currants, wash and drain well. Strip the berries, except for two panicles for decoration, from the stems with a fork. Cream fat, vanilla sugar and sugar.
Add the eggs one by one. Mix flour, cornstarch and baking powder, sieve onto the fat egg mixture and stir in with the milk. Carefully fold the currants into the dough and spread into a greased springform pan (24 cm Ø).
Bake in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 1 hour. Cover the cake with baking paper for the last 20 minutes. Let the cake cool down. Dust with icing sugar. Decorate with panicles and lemon balm before serving.