In a bowl whisk together flour, salt and sugar. Cover this bowl and keep it in the refrigerator for 30 minutes. This step is optional.
Add very cold cubed butter into the bowl next. Also add the shortening.
Using a pastry cutter or 2 forks cut the butter and the shortening into the mixture till it resembles coarse crumbs. Few large pieces of butter are okay.
Now add ice water, 1 tablespoon at a time. Stop adding more water once the dough starts clumping together.
At this point, transfer the dough to a well floured surface. Using your hands bring it all together. Once your dough comes together divide it into 2 equal havles.
Wrap each part with a cling sheet and chill in the refrigerator for 2-3 hours before using it in the recipe. Overnight is even better.
Once the dough is chilled, roll the dough and make pie!