Melt the chocolate in a microwave in 30second bursts, stir and allow to cool to room temperature; once cooled, brush a layer of white chocolate on the inside of each pastry case then leave to set
Beat together the mascarpone, crème fraiche and vanilla until well blended, then beat in the remaining melted white chocolate; divide the mixture between the pastry cases
Arrange the strawberries cut-side down on the filling; gently heat the jam with 1 tbsp water then brush over the strawberries to coat evenly; leave to set, then serve; best eaten on the day of making
6 servings