cut each cake into two layers. 4. Set one cake layer down, then spread frosting over the layer, set another cake on top and repeat until you have all four layers stacked. 5. Frost the entire cake 6.Make ganache and divide it into 7 little bowls and add food coloring . Set that over some parchment Start at one end of the cake and pour a spoonful of coloured ganache over the top edge, allowing it to dribble down the sides.