Slice this cake to reveal zebra stripes inside! Making it is fun, and the technique is easier than you might expect. Chocolate and vanilla batters are layered in the centers of two cake pans. As the batters spread they create concentric circles. Once baked, assembled, and sliced, those circles create a zebra-like stripe inside the cake.I use unsweet black cocoa powder, but regular dark cocoa powder (such as Hershey’s Special Dark) will also work for a bold stripe. The effect will also work with regular cocoa powder, but the stripe will be brown instead of black.Stock up on eggs, because this cake uses many egg whites! I often use carton egg whites for my Swiss meringue buttercream recipe. If you do this, be sure the carton says 100% egg whites.