
For the chocolate cake
200g (7 oz) good-quality dark cooking chocolate
150g (5½ oz) unsalted butter
6 eggs
50g (1¾ oz/scant ½ cup) cornflour (cornstarch)
150g (5½ oz/2/3 cup) caster (superfine) sugar
1 tsp fleur de sel
For the whipped cream
250ml (8½ fl oz/1 cup) whipping cream
5 sprigs of fresh thyme, plus an extra sprig to serve
1 tbsp mascarpone
1 tbsp icing (powdered) sugar