Cream fat and sugar. Stir in eggs one after the other. Add lemon zest. Mix flour, cornstarch and baking powder, sieve onto the egg-fat mixture and stir in. Spread on a greased baking tray (38 x 32 cm) sprinkled with breadcrumbs.
Bake in the preheated oven (electric: 175°C/ gas: level 2) for 20-25 minutes. Squeeze lemons and mix juice with icing sugar. Prick hot cake close together with a wooden skewer.
Spread lemon icing over it and let it cool down. Cut 4 circles (each approx. 8 cm Ø), 4 squares (each 7 x 7 cm), 4 rhombs (each 7 x 7 cm) and 3 squares (each 9 x 9 cm) from the cake.
Halve the 3 big squares to 6 triangles. Cut 4 strips from parchment paper, lay them around the circles and glue the ends together. Soak the gelatine. Drain the pineapple and tangerines. Sort blackberries and blueberries, wash carefully and drain.
Wash, clean and slice the strawberries. Peel, halve and slice the kiwis. Stir quark, sugar and vanilla sugar until smooth. Squeeze the gelatine, dissolve and stir into the quark.
Cold. Whip cream until stiff and stir in as soon as the quark mixture begins to set. Pour some cream quark into a piping bag with star-shaped spout. Fill round pieces with quark, put them in a cold place.
Coat the remaining particles with quark mixture. Colourfully cover with fruit. Loosen parchment paper to cover the round particles. Decorate the tartlets with cocktail cherries, chocolate leaves, brittle, pistachios, lemon julienne and quark-cream tuffs.
Makes 18 pieces.