Cream fat, sugar and salt. Add eggs and lemon peel and stir until foamy. Mix flour, cornstarch and baking powder and stir into the fat mass together with the milk. Fill into a greased springform pan (24 cm Ø) and smooth it down.
Bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for about 20 minutes. Let them cool down. In the meantime, drain the apricots on a sieve and collect the juice. Prick the cake several times with a wooden skewer and sprinkle with about 4 tablespoons of juice.
Mix cream cheese, quark, lemon peel, vanillin sugar and 1 tablespoon of sugar. Spread on the cake. Cover with apricots. Fill apricot juice with a little water to 1/4 litre of liquid.
Mix cake glaze and juice in a pot and bring to the boil. Spread the glaze over the apricots and put the cake in a cool place. Whip cream and remaining sugar until stiff. Pour into a piping bag with a star-shaped spout and decorate the edge of the cake with cream strips.
Serve sprinkled with pistachios. Makes about 12 pieces.