Separate eggs. Melt the fat and let it cool down a little. Beat egg whites until stiff. Sprinkle in sugar. Add rum-back and continue beating until the sugar is dissolved. Fold in egg yolk.
Mix flour and baking powder. Sieve onto the egg mixture. Add the fat and carefully fold everything in with a whisk. Line the bottom of a springform pan (18 cm Ø) with baking paper. Fill in sponge mixture and smooth it down.
Bake in the preheated oven (electric cooker: 175 - 200 ° C/ gas: level 2-3) for 25-30 minutes. Take the cake out of the oven, remove from the tin and let it cool down on a cake rack. In the meantime, remove 10 tablespoons of milk for the cream and stir with the pudding powder, vanilla sugar and sugar until smooth.
Bring the rest of the milk to the boil, add the coffee. Stir in the pudding powder and bring to the boil. Pour the pudding into a bowl, cover the surface with foil (to prevent skin formation) and allow to cool.
Cream butter. Stir in pudding by the spoonful with a whisk. Cut the cake base twice. Sprinkle the cake base with amaretto. Spread the bottom cake layer with 1/3 of the cream, place the second layer on top and spread with 2/3 of the cream.
Cover with the last floor. Spread the rest of the cream all around the cake. Decorate the edge with a serrated pastry card. Knead the marzipan raw mixture with icing sugar. Colour 75 g with a few drops of green food colouring.
Dye 30 g each yellow and pink. Roll out remaining marzipan to a thickness of about 1/2 cm and cut out (or shape) small bunnies with a mould. Press green marzipan through a garlic press. Form small eggs from the pink and yellow marzipan.
Decorate the cake with bunnies, grass, eggs and bark chocolate. Makes about 8 pieces.