This cake is not for the feint-hearted! It is psychedelic on the inside and choc-full of sweets on the outside.
There are two ways to make a Rainbow Cake.
The first is to layer the colours in the same pan. This gives you a mind-blowing array of colours. Unfortunately you can never tell exactly how this kind of cake will turn out. It might look like a rainbow…or it might look like a hyperactive child’s painting experiment.
The second is to make each layer individually and then stack them with white butter cream icing. This method will be covered in a later post. It results in an orderly cake with distinct rainbow properties. It involves slightly more work as you have to torte the layers and ice and stack them as well. For a lovely example, head over to Seriously Daisies and have a look at her Rainbow Cake.
Read on if you want to make the easier of the two options.
All-in-One Rainbow Cake Intructions
Make your cake batter as normal. I suggest using this recipe for a simple no-fail Sponge.
Divide your mixture into 6 containers and colour each with gel food colour. Don’t use stock-standard food colour. You will end up with a pastel mess. Keep in mind that, with gel food colours, the colour deepens as it stands, so don’t go overboard.
Next grease (and line) two 8″ cake pans.
In South Africa we had a series called Storieman. It had tapes with stories on (yes!) and books to go with the tapes. On one of these tapes there was a story about a rainbow and they urged you to remember the acronym Roggbiv (Roygbiv in English) whenever you couldn’t remember the order of the colours in the rainbow.
To make things easier, we are going to start from the Red side of the spectrum for the first layer, and from the Purple side of the spectrum for the second layer.
Starting with the red, place about 3/4 of the Red batter into the centre of your cake pan. Place 3/4 of the Orange batter on top of the red. You want to place it bang in the centre of the red so that the red oozes out on all sides. Place 1/2 of the Yellow batter on top of the orange, again making sure that you place it dead centre. Now do the same with 1/2 of the Green batter. Lastly add 1/4 of the Blue followed by 1/4 of the Purple.
In the other cake pan, layer the remaining 3/4 of the Purple, followed by the remaining 3/4 of the Blue. Then add the Green, Yellow, Orange and Red.
Bake as per the instructions in the recipe and ice however you desire!
You will end up with something more or less like this.
Have a lovely, creative day!