Stir 50 ml milk, pudding powder and sugar until smooth. Boil 550 ml milk. Stir in the pudding powder, bring to the boil and simmer for about 1 minute while stirring. Cover the surface of the pudding with foil and refrigerate for about 2 hours. Whip cream until stiff. Put 3 tbsp aside for decoration.
Stir the cold pudding until creamy. Fold in cream. Grate 80 g chocolate. Layer pudding cream and grated chocolate alternately in four dessert glasses. Finish with cream. Melt 20 g chocolate in a bain-marie. Decorate dessert with cream and liquid chocolate.