How to make Grandmas BlackBerry Pie

Blackberry Pie
6 cups of blackberries separated
1/4c plus 1 tablespoon cornstarch
1/2 tsp cinnamon
1/2 tsp salt
1 cup sugar
2 tbsp lemon juice
1/2 cup water
2 tbsp butter
1 baked and cooked pie shell
Combine 2 cups of the blackberries and rest of Ingredients in a saucepan . Bring to a simmer. Once mixture is as thick as jelly pour it into pie shell that has 2cups of berries lining the bottom of it. Sprinkle rest of blackberries on the top. Chill overnight in fridge. Enjoy!!!