Rainbow Cake

While having an edible one night, a friend requested that for her upcoming birthday, she wanted a rainbow cake. I decided she needed a double rainbow cake instead. 

After the birthday, I got so many requests, here are the directions how to make it.


Chocolate Buttercream Frosting
6oz dark chocolate, 70% cocoa
1/3c heavy cream
1/4c butter, room temperature
2-3c confectioners sugar

Cake
1 box yellow cake mix, follow directions on the box to make the batter.
OR
1c butter, softened
1/2c vegetable shortening
3c granulated sugar
5 eggs
3c all purpose flour
2tsp baking powder
1/4tsp salt
1/2c whole milk, room temperature
1/2c buttermilk, room temperature
2tsp vanilla extract


For the frosting, melt chocolate in a double boiler. Add cream to make a ganache let cool to room temperature. Place ganache and butter in a stand mixer and beat until mixed well. Add sugar.

To make the cake, once you've made the batter, separate into bowls and mix with food coloring, pouring them by color into a parchment lined pan. By pouring the batter in the center, it will push the colors out and form the rings.

Bake the 2 cakes and let completely cool. Trim the top off to make cake flat before frosting.