RED VELVET CHOCOLATE CAKE

Steps:

• Heat oven to 350 degrees. Generously butter two 9-by-2-inch round cake pans. Sprinkle with flour, and tap out the excess; set aside. In a medium bowl, whisk cake flour, salt, and cocoa; set aside.
• In the bowl of an electric mixer fitted with the paddle attachment, combine the sugar and oil, and beat on medium speed until well combined. Add eggs, one at a time, beating well after each addition. Add food coloring and vanilla, and beat until well combined. Add flour mixture, alternating with buttermilk, scraping the sides of the bowl with a rubber spatula as needed.
• In a small bowl, mix baking soda and vinegar until combined. Add to batter, and beat for 10 seconds. Evenly divide batter between the prepared pans. Bake until a cake tester inserted in the center of each cake comes out clean, 30 to 35 minutes. Transfer to a wire rack to cool in the pans for 5 minutes. Remove from the pans, and return to the rack to cool completely.
• Spread 1 1/2 cups of the frosting on one of the layers. Place the second layer on top; spread and swirl the remaining frosting around the sides and top of the cake.The cake can be stored in the refrigerator for up to 6 hours. Bring to room temperature before serving.