Step 4: Prepare the Frosting
While the cake is baking, I let my frosting sit on the counter to come to a spread-able consistency. It took about ½-hour in my home.
Once the frosting is spreadable, in small bowl, stir 1 cup of the frosting with 15 to 20 drops green food coloring.
Stir 15 to 20 drops red food coloring into remaining frosting.