Finely chop the chocolate. Cream fat, sugar, vanillin sugar and salt. Stir in the eggs one by one. Mix flour, starch and baking powder and stir in alternately with the milk. Fold in chocolate.
Grease a box form (30 cm long; 2 litres capacity) and dust with flour. Fill in the dough and smooth it down. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 60-65 minutes. Leave to cool in the tin for 10 minutes. Turn out onto a cake rack and allow to cool. Melt the chocolate coating and coconut oil over a warm water bath. Turn the cake over, cover with the chocolate coating and allow to dry. Whip the cream until stiff, fill into a piping bag with star-shaped spout. Spray tuffs onto the cake.
Turn out onto a cake rack and allow to cool. Melt the chocolate coating and coconut oil over a warm water bath. Turn the cake over, cover with the chocolate coating and allow to dry. Whip the cream until stiff, fill into a piping bag with star-shaped spout. Spray tuffs onto the cake. Sprinkle with chocolate rolls
waiting time approx. 2 hours