Beat the shortening and salt in a large bowl until combined. Add boiling water and beat until combined. Let cool to room temperature, stirring again if the shortening and water start to separate.
Stir in flour and form the mixture into a ball. Do this quickly and do not over mix or you will get tough crust. Chill for several hours or overnight.
To bake, remove from refrigerator 30 minutes before rolling.
For a prebaked crust roll out to ⅛" thickness. Place in pie pan and trim edges as needed. Prick crust with a fork (or use pie weights) and bake at 425°F for 15 minutes until golden.
Notes
The recipe makes enough for two 8-inch with top crust or two 9- or 10- inch pies without top crusts.