Peel, wash and finely grate the carrots. Separate eggs. Cream egg yolk, 200 g sugar and vanillin sugar. Stir in salt, grated lemon peel and cinnamon. Mix hazelnuts, flour, breadcrumbs and baking powder, add to the dough with the carrots and mix well.
Beat egg white and remaining sugar until stiff and fold in carefully. Grease a baking tray (38x32 cm) and spread the dough evenly on top. Bake in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 30 minutes.
Let the cake cool down. Stir 250 g icing sugar and 3-4 tablespoons of water until smooth. Coat the cake with the icing and let it dry. In the meantime knead marzipan with the remaining icing sugar. Divide marzipan into 3 portions.
Knead 1/3 with green food colouring, 1/3 with yellow and red food colouring. Divide the rest of the marzipan again. Knead one half with 1/2 teaspoon cocoa. Press green marzipan through a garlic press and form small nests.
Shape brown and light marzipan into bunnies. Form small carrots from the reddish marzipan. Cut 7 pistachios in half lengthwise and decorate the carrots with them. Finely chop the remaining pistachios. Dust the cake with the remaining cocoa and sprinkle with the remaining pistachios.
Cut the cake into 25 pieces and decorate with marzipan carrots, nests and bunnies. Makes 25 pieces.