Grease a ring cake tin (2.5 litres capacity) and dust with flour. Chop the chocolate. Heat the cream, bring to the boil briefly. Halve the cream. Put chocolate in one half and let it melt in the hot cream.
Stir espresso powder and caramel syrup into the other half. Leave to cool at lukewarm. Cream fat, salt, sugar and vanilla sugar. Stir in the eggs one after the other. Mix flour and baking powder and stir into the fat cream. Halve the dough. Stir caramel espresso cream and cocoa into one half and chocolate cream into the other half. Alternating in blobs of light and dark dough, put into the mould, marble with a fork. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 1 hour. Leave to rest in the mould for 10 minutes.
Halve the dough. Stir caramel espresso cream and cocoa into one half and chocolate cream into the other half. Alternating in blobs of light and dark dough, put into the mould, marble with a fork. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 1 hour. Leave to rest in the mould for 10 minutes. Turn out onto a cake rack and let it cool down. Dust with icing sugar
waiting time approx. 2 hours