Using a serated bread knife, carefully cut the edges from the cake. Measure and cut the cake into thirds and then those thirds in half, making six layer. This will yield two cakes with three layers each.
Place one layer on a plate. Prepare a pastry bag with a large star tip and pipe the frosting evenly across the top of the cake. Top the frosting with sliced bananas leaving enough for one more layer.
Place another layer of cake on top and repeat with frosting and bananas.
For the third layer, pipe frosting into straight lines or stars to decorate. (No bananas)
Repeat with the second cake.
Cover and refrigerate. (Place skewers or toothpicks in the corners of the cake to hold the plastic wrap off the frosting). This cake tastes best after it rests in the fridge for a few hours, or better yet, overnight. Serve cold. (Cuts beautifully with an electric knife)