6 cups assorted fresh berries – blackberries, raspberries, and blueberries
1/2 cup butter, softened
2 large eggs
2 tablespoons red liquid food coloring
1 teaspoon vanilla extract
1 1/4 cups all-purpose flour
1 1/2 tablespoons unsweetened cocoa
1/4 teaspoon salt
1/2 cup buttermilk
1 1/2 teaspoons white vinegar
1/2 teaspoon baking soda
Instructions
Preheat oven to 350°.
In a large bowl, stir together cornstarch and 1/2 cup sugar. Toss berries with cornstarch mixture, and spoon into a lightly greased 11- x 7-inch baking dish.
Beat butter at medium speed with an electric mixer until fluffy; gradually add remaining 3/4 cup sugar, beating well. Add eggs, 1 at a time, beating just until blended after each addition. Stir in red food coloring and vanilla until blended.
Combine flour, cocoa, and salt. Stir together buttermilk, vinegar, and baking soda in a 2-cup liquid measuring cup. (Mixture will bubble.) Add flour mixture to butter mixture alternately with buttermilk mixture, beginning and ending with flour mixture. Beat at low speed until blended after each addition. Spoon batter over berry mixture.
Bake at 350° for 45 to 50 minutes or until a wooden pick inserted in center of cake topping comes out clean. Cool on a wire rack 10 minutes.
Serve cake in clear glasses or small mason jars layered with vanilla ice cream.
