Preheat the oven to 400 degrees F.
Make the pastry crust: Mix flour and salt together in a bowl. Cut in shortening with a pastry blender until mixture resembles coarse crumbs. Mix in 3 tablespoons water, one at a time, until dough is moist enough to hold together. Add up to 1 more tablespoon water if needed.
Shape dough into a ball with lightly floured hands. Roll dough on a lightly floured surface to a thickness of 1/8 inch. Place a 9-inch pie pan upside-down on the dough; use a sharp knife to cut a circle of dough 1 1/2 inches larger than the pie pan. Remove and discard dough scraps and set pie pan aside.
Gently roll circular piece of dough around the rolling pin; transfer it right-side up over the pie pan. Unroll, easing dough into the bottom of the pan. Use two hands to flute the dough around the top edges.
Make the filling: Beat pumpkin, evaporated milk, brown sugar, eggs, cinnamon, ginger, nutmeg, and salt in a large bowl with an electric mixer until well combined. Pour into the prepared crust.
Bake in the preheated oven until a knife inserted into the filling 1 inch from the edge comes out clean, 40 to 60 minutes. Cover the edges with foil if needed to prevent from burning as the filling cooks.
Remove from the oven and cool to room temperature before serving.
