Orange cocoa cake recipe in the cake category

: Preheat oven to 350 degrees F. Grease three 8 or 9 inch round baking pans. Line with wax paper. Stir together cocoa and water in small bowl until smooth. Set aside. Beat butter, shortening, sugar, salt and vanilla extract in large bowl until well blended. Add eggs. Beat well. Stir 1 1/2 teaspoons baking soda into 1 cup buttermilk. Add to butter mixture alternately with flour. Measure 1 2/3 cups batter into small bowl. Stir in remaining 1/8 teaspoon baking soda and 3 tablespoons buttermilk, orange peel and orange extract. Pour into one prepared pan. Stir cocoa mixture into batter. Divide evenly between remaining two prepared pans. Bake 25 to 30 minutes or until wooden pick inserted in center comes out clean. Cool 10 minutes. Remove from pans to wire racks. Carefully peel off wax paper. Cool completely. Place one chocolate layer on serving plate. Spread with orange buttercream frosting. Orange buttercream frosting: Beat butter, 1 cup confectioners sugar, orange peel and vanilla extract in large bowl until creamy. Add remaining confectioners sugar alternately with milk, beating to spreading consistency.