Fill 1 cup of cream into a bowl. Wash the cup, dry well and use as a measuring cup. Cream fat, salt, sugar and vanilla sugar. Stir in eggs one after the other. Mix flour and baking powder, sieve onto the fat cream. Stir in briefly together with the cream.
Halve the dough. Stir in one half cocoa and 4 tablespoons advocaat. Pour light-coloured dough into a greased, flour-dusted box form (28 cm long, 2 litres capacity). Spread the dark dough over it. 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 pan for 10 minutes. Turn out onto a cake rack and let it cool down. Chop the chocolate coating and melt carefully over a warm water bath. Cover the cake with the chocolate coating and allow to dry. Whip 1/2 cup of cream until stiff. Pour into a piping bag with star-shaped spout.
Leave to rest in the pan for 10 minutes. Turn out onto a cake rack and let it cool down. Chop the chocolate coating and melt carefully over a warm water bath. Cover the cake with the chocolate coating and allow to dry. Whip 1/2 cup of cream until stiff. Pour into a piping bag with star-shaped spout. Spray tuffs onto the cake. Decorate with 1 tablespoon egg liqueur and grated chocolate
waiting time approx. 2 hours