This über-trendy cake is actually a vintage recipe from the Deep South. It is as red as Scarlet O'Hara's dress thanks to the combination of cocoa powder and cheap liquid red food coloring. Be sure to use the cheap stuff! Fancy food coloring pastes and gels don't work nearly as well. The vinegar was traditionally added to the baking soda as a leavener. With self-rising flour, it's not necessary, but it's added here for its classic zippy flavor.
Topping Ideas: Cream cheese frosting, Marshmallow Fluff, whipped cream, fresh berries, red sugar sprinkles, candied pecans, or chocolate shavings.
Variation:
Blue Velvet: You never know when you may need to make a blue cake. It's easily done by replacing cheap red liquid food coloring with cheap blue liquid food coloring. For any other cake color, you'll want to omit the cocoa powder, as it will give all other food colors a tinge of brown. If you make another color, replace the cocoa powder with an equal amount of flour.
