I work mostly in buttercream. Here is what I suggest. Frost the top and inner slice pink. Frost the outer edge green, being careful where it connects to the pink/red. Pipe a white border where the pink meets the green. When it is complete, add the black details. As far as striping the green on the outside...you can pipe with a 12 tip with the 2 different color greens, then viva method the sides. Good luck!
5/8/13 at 1:00pm