Roughly chop the chocolate or break it into pieces. Remove 6 tbsp. of the milk and stir in a small baking bowl with the pudding powder and sugar until smooth.
Bring the remaining milk to the boil in a saucepan (be careful: it will boil over quickly!). Melt chocolate in it, stirring throughout. Remove the saucepan from the stove.
Stir in the pudding powder evenly with a whisk so that no lumps form. Bring to a boil, stirring, and roll gently for 1 minute.
Pour pudding into a large bowl. Place plastic wrap on top to prevent a skin from forming. Set aside to cool for about 1 hour. Or fill into 4 rinsed ramekins (200 ml each) and leave to cool for at least 3 hours.
Remove foil and beat pudding in large baking bowl with whisk until hearty and creamy. Fill into cappuccino dessert bowls or possibly cups and dust with cocoa.