1. Preheat oven to 325°F.
2. Spread the pie filling in the bottom of a lightly greased 9 x 13 inch cake pan.
3. Sprinkle the pie filling with the lemon juice.
4. In a bowl, mix remaining ingredients to a nice crumble.
5. Pour onto the top of the pie filling.
6. Bake at 325°F for 1 hour or until nicely golden brown.