Other than apples, there are also many fruits that make too much juice as they cook in a pie. And this juices will cause the pastry to become soggy or make it stick to the tin on cooling. To avoid the juices from leaking, toss the fruit in a little cornflour as this will soak up the juices and help to thicken them as they cook. Besides, you can also flavor the cornflour with spices of your choice if you prefer.
** Asian Recipes