Separate 1 egg. Mix 125 g flour and baking powder. First knead with 50 g sugar, 1 packet of vanilla sugar, 75 g butter in pieces, 1 egg yolk and 1 tbsp. cold water using the dough hook of the hand mixer. Then briefly knead with your hands until smooth. Cover the short pastry and chill for approx. 30 minutes
Only half grease a fat pan (approx. 32 x 39 cm). Roll out the dough to a rectangle (approx. 19.5 x 32 cm). Prick several times. Line the open side of the dough with a multiple folded aluminium foil as a rail. Pre-bake in the preheated oven (electric range: 175 °C/circulating air: 150 °C/gas: level 2) for approx. 20 minutes
Melt 50 g butter and let it cool down. Separate 2 eggs. Mix quark, 2 egg yolks, 3 eggs, 75 g sugar, 1 packet of vanillin sugar, lemon peel and 25 g flour. Stir in the liquid butter. Spread on the pre-baked base. Bake at the same temperature for another 20-25 minutes
Beat 3 egg whites until stiff. While continuing to beat, add 150 g sugar and lemon juice. Keep beating until the sugar is completely dissolved. Pour into a piping bag with a large star-shaped spout. Spray approx. 3 strips (approx. 6 cm wide) lengthwise onto the cake in waves. Bake the cake at the same temperature for another 20-25 minutes. It is best to let them cool down overnight; then usually "gold drops" appear on the meringue. Remove the aluminium rail. Dust the cake with icing sugar