Ingredients
- 5 cups blackberries
- 2/3 cup sugar
- 2 tablespoons cornstarch
- 1 tablespoon lemon juice
- 1 teaspoon lemon zest
- 1 1/2 cups flour
- 2 teaspoons baking powder
- 1/2 teaspoon salt
- 6 tablespoons cold butter
- 2/3 cup buttermilk
- 1/3 cup chopped fresh mint
