Heat the cream and the vanilla paste in a heavy-based saucepan.
Beat the egg yolks and caster sugar together until light and fluffy and then add the cornflour and flour.
Slowly beat the hot cream into the egg mixture and then pour the mixture back into the saucepan. Return to the heat stirring continuously until the mixture thickens. Bring, to the boil then simmer for at least 10 minutes to cook the flour. Remove from the heat and cover with cling film touching the surface. Allow to cool.
Brush each piece of pastry with melted butter and push them into the Le Creuset Bun Tray, two layers per cup.
Fill the pastry cases with the cooled custard and top with raspberries and hazelnuts. Bake at 180°C/160°C fan /Gas Mark 4 for 10 – 15 minutes, or until the pastry is golden brown and cooked.