Old school blackberry cobbler

Old school blackberry cobbler 3 cups of fresh blackberries 1 cup granulated sugar 4 oz butter 1 tablespoons cinnamon 1 tablespoons vanilla 2 cups pineapple juice or apple juice (juice preserves the natural fruit flavor) 2 tablespoons cornstarch Combine all ingredients( except cornstarch)in a boiler and bring to a boil Add cornstarch ( slurry) To pot and cook until thicken Pour into baking dish with raw bottom pie dough Add top crust and brush with melted butter and cinnamon sugar Cook in 350 degree oven for 45 minutes or until golden brown