Ingredients
- 6 cups fresh blackberries
 - 2 teaspoons lemon juice
 - 1 cup white sugar
 - 2 teaspoons cornstarch
 - 1/4 cup cold butter, cubed
 - 4 cups all-purpose flour
 - 1/4 cup white sugar
 - 1 teaspoon ground cinnamon
 - 1 tablespoon salt
 - 1 tablespoon baking powder
 - 2 teaspoons baking soda
 - 1 cup chilled butter, diced
 - 1 1/3 cups buttermilk, plus additional for brushing
 - 1/4 cup white sugar
 
Directions
Preheat an oven to 375 degrees F (190 degrees C). Butter a 9×13-inch baking dish.
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        Place the blackberries in a mixing bowl, and sprinkle with lemon juice. Toss with 1 cup sugar and cornstarch until evenly coated. Place into the prepared baking dish, and arrange the cubes of butter on top. In a large bowl, whisk the flour, 1/4 cup sugar, cinnamon, salt, baking powder, and baking soda together. Cut in 1 cup of chilled, diced butter using a pastry cutter until the butter is in pieces no larger than a pea. Stir in the buttermilk until a batter has formed. Spoon the batter evenly over the blackberries. Brush the top of the batter with additional buttermilk to moisten, then sprinkle with the remaining 1/4 cup of sugar.
Bake in the preheated oven until the the fruit is tender, and the biscuit top is golden, about 25 minutes.
