Auckland Castle pancetta, leek and mustard quiche Serves: 6 Ingredients 20cm round loose-based tart tin or ceramic dish ceramic baking beans greaseproof paper clingfilm for the pastry: 150g plain flour 75g butter pinch salt a little water for the filling: 200g pancetta lardons 1 leek, finely chopped 200ml double cream 100ml milk 100g grated mature