Let the puff pastry slices thaw for about 10 minutes according to the package instructions. Place 3 slices on top of each other and roll out into a square (approx. 29 x 29 cm) on a floured work surface. Place the dough on a baking tray lined with baking paper and let it rest for about 5 minutes
Place an opened springform ring (from a springform pan 26 cm Ø) on the dough and cut out a circle (28 cm Ø). Prick the base of the dough several times with a wooden skewer. Mix the egg yolk and about 1/2 tsp. cold water. Spread a thin layer on the base. Bake in the preheated oven 2nd shelf from below (electric oven: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 10-12 minutes until golden brown. Remove and let cool off
Roll out two more cakes from the remaining 6 slices of dough and bake one cake in the same way. Mark 12 cake pieces on the third cake layer with a wide knife (do not cut through). Bake the cake as described and cut into 12 cake pieces while still hot in the markings. Let it cool down
Wash the lemon thoroughly, dab dry and finely grate the peel. Squeeze 1/2 lemon. Mix mascarpone, quark, sugar, vanillin sugar, grated lemon peel and 2 tbsp. lemon juice with the whisks of the hand mixer until smooth. Remove approx. 1/3 cream and mix with the jam. Then fold into the remaining cream in streaks
Place a whole puff pastry base on a cake plate, spread half of the cream on top and spread loosely. Cover with the 2 cake bases and spread the rest of the cream on top. Place the little wings on the cake and press them at a slight angle into the cream. Dust with icing sugar
Waiting time approx. 45 minutes