Separate the egg. Stir pudding powder, sugar, 100 ml milk and egg yolk until smooth. Boil up the rest of the milk. Stir in the pudding powder and simmer for at least 1 minute while stirring.
Beat the egg whites with the whisks of the hand mixer until stiff and fold into the pudding. Pour the pudding into four cups (each containing approx. 150 ml) and allow to cool. Chill for at least 1 hour.
Chop the coffee beans. Chop chocolate and melt in a hot water bath. Spread on baking paper and sprinkle with coffee splinters. Let the chocolate set in the fridge. Break into pieces.
Decorate pudding with it and dust with cocoa.