This is one of my favorite cakes that I have made. I love the ombre look, and the rosettes are simple, yet elegant. The inspiration for this cake came from Ross Sveback. The recipe and instructions were posted in the Minneapolis, MN Star Tribune News Paper prior to Valentine's Day.
Start by mixing your cake batter. Depending on how many layers you want your cake to be, remove part of the batter. Add food coloring to remaining batter. Remove another portion of the batter. Add more food coloring and remove more of the batter. Continue this pattern until you have the batter divided into enough portions to bake as many cake layers as you want.
Here is an example of how your batter should look. Each layer should be slightly darker than the previous layer.
Mix the frosting for your cake and color the frosting in the same way that you did for the cake batter.
Bake all of the cake layers. Here are the results of the different colored cake layers.
Stack the cakes and dirty frost to hold in all of the crumbs.
Using a 1M decorating tip and the darkest color frosting create rosettes around the bottom of the cake.