Heat oven to 425. Mix flour and salt in a medium bowl. Using a pastry blender or fork, blend in the shortening until it forms a pea size shape. Do not over mix.
Sprinkle cold water over the top 1 tablespoon at a time until all the flour is moistened, tossing with a fork until pastry leaves side of the bowl.
Combine together with a wooden spoon then switch to your hand and gather pastry to form a ball.
Separate the pastry into two equal parts. One will be for the bottom crust and one for the top crust.
Take one ball and flatten on a lightly floured surface.
Roll pastry using floured rolling pin into a circle 2 inches larger than your upside down pie plate.
Transfer pastry to pie plate.
In a bowl, combine blackberries, sugar and 1/2 cup of flour. See notes if for frozen blackberries.
Pour blackberries into pie pastry.
Repeat the rolling out process for the second pie pastry and place on top of the pie.
Cut off the excess pie crust.
Seal the two pie pastries together by rolling them under then flute the edges.
Poke holes with a fork or cut slits on the top of the pie.
Cover the crust with 2-3 inch strips of aluminum foil. Bake for 30 minutes.
Remove the foil and continue baking the pie for an additional 15 minutes.
Take pie out of oven and allow it to cool on a wire rack for 2 hours.
Serve on its own, with ice cream, or whipped cream. Enjoy!