Grease a ring cake tin (approx. 1.6 l capacity) and sprinkle with breadcrumbs. Pluck or cut marzipan into pieces. Separate the eggs. Preheat the oven (electric cooker: 175°C/circulating air: 150°C/gas: level 2).
Cream 200 g butter with the whisks of the mixer. Stir in the egg yolks separately and 100 g sugar. Stir in marzipan and vanilla sugar until the dough is frothy and the.
sugar has dissolved. Beat the egg whites and 1 pinch of salt with the whisks of the mixer until very stiff, adding 50 g of sugar. Mix flour, wholemeal flour, baking powder and almonds. Stir egg whites and flour mixture loosely with a wooden spoon into the butter mixture.
Stir only briefly until all ingredients are mixed.
Break chocolate into pieces. Melt in a hot water bath. Approx. 1⁄3 of the dough into a second mixing bowl. Stir in cocoa, liquid chocolate and amaretto with a wooden spoon.
Fill half of the light-coloured dough into the mould. Spread the dark dough over it. Fill in the rest of the light-coloured dough. Use a fork to pull the dough spirally through (marble).
Bake in a hot oven for 40-45 minutes. After approx. 40 minutes, check with a long wooden skewer whether the dough is baked through. If there is still tough dough sticking to the skewer, bake the cake for another 5 minutes (not longer, otherwise the cake will get dry).
Place on a cake rack and leave to cool in the mould for about 30 minutes. Then turn out and let it cool down.
In the meantime, chop the white and fine chocolate separately. Melt the fine chocolate coating in a hot water bath. Cover the cake with it. Let it dry. Melt the white couverture in a hot water bath. Let it cool down a bit, then run it over the dark icing and let it dry.