Knead flour, baking powder, sugar, vanillin sugar, salt, lemon peel, egg and fat in flakes to a smooth dough. Cover the dough and let it rest in the refrigerator for 2 hours. Cut marzipan into cubes.
Sieve 3 tablespoons of icing sugar onto the marzipan, add egg white and 2 tablespoons of jelly and mix with the whisk of the hand mixer. Divide the dough into three. Press 1/3 of the dough into a greased springform pan (26 cm Ø), prick several times with a fork and bake in the preheated oven (electric cooker: 200°C/ gas: level 3) for 12 minutes.
In the meantime, roll out the remaining dough into a rectangle (55x30cm) on a floured work surface. Remove the base from the oven and spread with the remaining jelly. Spread the dough with the marzipan mixture, sprinkle 100 g nuts on top, roll the dough up from the long side and cut it into approx. 22 slices (2.5 cm thick).
Place the slices on the already baked base and bake in the preheated oven (electric: 175°C/ gas: level 2) for 50-60 minutes. Before serving, serve the cake dusted with the remaining nuts and remaining icing sugar.
Results in about 20 pieces.