Defrost the strawberries. For the chocolate sauce, break the chocolate into large pieces. Heat 100 g cream in a small pot. Add the chocolate and melt it while stirring. Leave to cool, stirring from time to time.
Then pour evenly into four dessert glasses and chill.
Cut the vanilla pod lengthwise and scrape out the pulp. Bring 300 g cream, icing sugar, vanilla pulp and pod to the boil in a saucepan and simmer at low heat for 8-10 minutes.
In the meantime, soak the gelatine in cold water for about 5 minutes. Puree the strawberries very finely with a hand blender. Remove the vanilla cream from the stove and stir in the strawberry puree. Squeeze the gelatine and dissolve it in the hot vanilla-strawberry cream while stirring.
Spread strawberry pannacotta evenly into the dessert glasses on top of the chocolate sauce. Chill for at least 4 hours, preferably overnight.