2 cups all-purpose flour
1 teaspoon salt
3 tablespoons granulated sugar
⅔ cup shortening
4 to 6 tablespoons cold water
¾ cup of sugar
1/3 cup all-purpose flour or other pie thickeners
6 cups fresh blueberries
1 tablespoon lemon juice
Put the flour, sugar, and salt in a large food processor fitted with the metal blade and pulse a few times to combine. Add the shortening and pulse 2-3 times until the shortening is broken up into smaller pieces.
Slowly begin to add the water through the top spout of the processor and then while still pouring, run the food processor until all the water has been added and the mixture begins to come together (mixer will actually begin to make a different sound), but stop before it forms a complete ball. If too dry, add the extra tablespoons of water, one at a time.
Turn dough out onto a clean surface and form into a ball. Divide the dough into 2/3 and 1/3; shape into 2 flattened rounds on a lightly floured surface. Wrap in plastic wrap. Refrigerate for about 30 minutes or until the dough is firm and cold, yet pliable. This allows the shortening to become slightly firm, which helps make a flaky pastry. If refrigerated longer, let pastry soften slightly before rolling.
Heat oven to 425°F.
With a floured rolling pin, roll the larger piece of dough into a round 2 inches larger than the upside-down 91/2 to 10-inch glass pie plate. I roll the dough between floured pieces of parchment paper or plastic wrap. Fold pastry into fourths; place in the pie plate. Unfold and ease into the plate, pressing firmly against the bottom and sides.
For the filling
In a large bowl, mix sugar and thickener. Stir in blueberries and lemon juice. Spoon into pastry-lined pie plate. Cut butter into small pieces and sprinkle over blueberries.
Roll the smaller piece of dough into a 10-inch round. Cut into 1-inch strips with a pastry cutter. Place the strips in a lattice formation over the berries. Seal the edges and crip the pastry all around the dish. Sprinkle the lattice crust with granulated sugar. Place the pie on a parchment-covered baking sheet to catch any drips during baking.
Bake the pie for 15 minutes, then reduce the oven heat to 350°F and bake for another 45 to 50 minutes, covering the edges with a piece of foil if they seem to be browning too quickly. When done, the filling will be bubbling and the crust golden brown. Remove the pan from the oven and cool the pie on a wire rack for at least 2 hours before serving.