Place oven rack on lowest setting and heat oven to 400.
Prepare crust in medium chilled glass or metal bowl.
Mix flour, salt and using a pastry blender or 2 butter knives, cut shortening into flour until course crumbles form (pea size).
Add water 1 T at a time tossing gently with fork until dough forms
Shape into a disk and wrap in plastic, chilling for 30 minutes.
On a floured surface, using a floured rolling pin, roll dough into 12" circle to fit in Pie tin
Mix filling and spoon into crust.
Mix topping with pastry blender until crumbly then sprinkle over filling.
Bake 35 minutes. Cover pie crust with foil until last 10 minutes to prevent burning.