Method

1. Preheat the oven to 200C/400F/Gas 6.

2. Place the butter, sugar and flour into a food processor and blend to a dough.

3. Add the egg yolk and eggs and blend again until a smooth consistency is reached.

4. Add the melted chocolate and blend again briefly.

5. Grease and flour a 25cm/10in sandwich tin. Spoon the chocolate mixture into the sandwich tin ring and place into the oven to bake for ten minutes, or until risen and cooked through.

6. For the sauce, place the sugar and butter into a small pan over a medium heat. Heat until golden and caramelised, then add the hazelnuts and stir well to coat. Add the cream and stir well.

7. Allow the fondant to cool slightly, then carefully remove from the sandwich tin. Spoon over the sauce and serve.