5.  Form into ball.

6.  Roll out dough to 1/8 inches thick.

7.  Fit dough into prepared pie plate.

8.  Flute edges and chill for 10 minutes.

9.  Prepare Apple Filling: Pare and slice apple thinly.

10.  Put apple slice in a bowl and sprinkle with calamansi juice.

11.  Combine with sugar, cinnamon and nuts. Toss into the apple slices. If very juicy add flour.

12.  Turn into prepared crust.

13.  Top with grated cheese.

14.  Prepare Topping: Cut in chilled butter into flour. Add Walnuts and brown sugar.

15.  Sprinkle mixture on top of apple filling.

16.  Bake for 30 to 40 minutes or until golden brown.