So here's the multi coloured rainbow cake I made two nights ago. It's essentially a plain white vanilla cake, with a twist. We poured the white batter into four different containers and added a different food colouring into each. Then we poured each coloured batter into the baking tray and shoved in the oven. We had enough batter for two 6 inch cakes and then squidged the two together with chocolate ganache. I LOVE THIS CAKE!!!