However, this is not the traditional recipe from my family (although it is great). This recipe has a thicker sauce, more like a jam.
Blackberry Pie Filling
6 cups of blackberries
2 cups of sugar (more or less depending on tartness of berries)
4 tablespoons of lemon juice
6 tablespoons of corn starch
2 teaspoons of vanilla extract
3/4 teaspoon of cinnamon
Pour the ingredients into a sauce pan and stir over medium heat. Let the mixture simmer for 30 minutes, or until thick (sticking to the spoon). Stir every so often. Tasting is really helpful to figure out if you need more cinnamon, lemon juice, or sugar.
Let the sauce cool before pouring it into your pie pan with crust.
2 1/2 cups all-purpose flour
2/3 cup shortening
6 to 10 tablspoon cold water
1/2 teaspoon salt
Stir together flour and 1/2 teaspoon salt. Using a pastry blender, cut in shortening till pieces are pea-size.
Sprinkle 1 T. Of the water over part of the mixture; gently toss with a fork. Push moistened dough to the side of the bowl. Repeat moistening dough, using 1 tblspn of the water at a time, till all the dough is moistened. Form dough into a ball.
On a lightly floured surface, use your hands to slightly flatten dough. Roll dough from center to edges into a circle about 12 inches in diameter.
To transfer pastry, wrap it around the rolling pin. Unroll pastry into a 9-inch pie plate. Ease pastry into pie plate, being careful not to stretch pastry.
Trim pastry to 1/2 inch beyond edge of pie plate. Fold under extra pastry. Crimp edge as desired. Do not prick pastry.
Don't make your vents like I did. Please. For me. Don't make them look like a pig snout. Sloppy cuts that look like nostrils...