Share a little about the materials, processes, and techniques used to create this cake Sponge cake, Fondant icing, Gum Tragacanth icing, food colouring. What advice would you give someone starting this project? The actual T-chest & the contents are made of Tragacanth icing & cannot be eaten, this is the part that can be kept as a keepsake. The T-chest & the top (with the tea towels, pots & pans) lifts of & hides a plainly decorated cake. Plan ahead to give the separate parts time to harden, to be decorated & to be assembled. Double check the finished cake size, to make sure it will fit underneath the T-chest.