Clean, wash and drain gooseberries well. Cream soft fat, 250 g sugar, 2 packets vanilla sugar, lemon peel and salt with the whisks of the hand mixer. Mix in the eggs one after the other, alternating with the cornflour. Stir in sour cream as well. Mix flour and baking powder and stir in briefly. Put the dough into a greased, breadcrumbed pan of the oven (approx. 34x38 cm) and smooth it down.
Spread gooseberries on the dough and sprinkle with almond flakes, remaining sugar and vanillin sugar. Bake in the preheated oven, mid-height (electric oven: 175 °C/ gas: level 2) for 45-50 minutes. Let the cake cool down and cut into 16-20 pieces. Arrange on a plate and serve decorated with lemon balm. Serve with whipped cream