Mix the custard powder with the cocoa and sugar. Then mix the whole thing with the milk / cream mixture. Bring the remaining milk and cream to the boil and cook the pudding as directed. Finally stir in the finely broken dark chocolate.
For the vanilla sauce, stir the egg yolks with the sugar until frothy. Bring the milk with the cream and the vanilla pulp to the boil; Let cool a little and add lukewarm to the egg mixture. Pour the milk and egg mixture into a saucepan and let it boil briefly. After 3 - 4 minutes the mass begins to bind. Then chill in the refrigerator.