Drain fruits separately. Grease a fat pan (approx. 32 x 39 cm), dust with flour
Cream 300 g butter, sugar, 1 pinch of salt and lemon zest. Stir in eggs, sour cream and lemon juice one after the other. Mix 500 g flour and baking powder, stir in briefly. Spread the dough on the fat pan. Spread the fruits as vertical stripes on top. Bake in a hot oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for approx. 30 minutes
Warm the jams separately. Spread gooseberries and apricots with yellow and cherries with red jam. Let cool off
Cut each fruit strip into 10-12 cake pieces. Whip cream and vanilla sugar until stiff. Decorate the tartlets