Chop the chocolate and melt it with the butter in a pan on low fire. Then add the milk, sugar, salt and cornstarch.
Bring it to a boil while continuously whisking. Then boil for 1 minute.
Stir in the vanilla extract and pour the pudding into 4 cups. Let it cool.
Add all the cream ingredients in a bowl and mix with a hand-mixer until stiff.
Top the pudding with the cream and decorate with berries and chopped chocolate. Store in the fridge for 2-3 days.