Six weeks

[bacony]

Comments

[freddiefraggles]

As far as I'm aware, rainbow sponge cake is just thin sponges with the appropriate food colouring in the right order. Possibly the sort of mixture one might use for a swiss roll or jam roly poly, one that doesn't rise much. And then some sort of icing inbetween to stick it together.

[bacony]

Yeah, but you need a bakefast food colouring, unlike the ones I currently own which stop working as soon as I heat them up...

[freddiefraggles]

Could well have been something like this recipe - ingridcreates.com/recipe-for-rainbow-layer-cake/ - which uses food colouring gels rather than liquid and only the whites of the eggs to negate the slight yellowy colour of a natural cake.

www.tastespotting.com/tag/rainbow this is pretty cool :)

[lucian_albrecht]

I've done checkered sponge before (with plain and chocolate sponge) and I guess something similar could work. I didn't know normal food colouring wasn't heat-stable....

[lucian_albrecht]

thinking about it, you could use various fruit juices, saffron, etc., for the colouring?

[freddiefraggles]

Beetroot for red, for example? I wonder if a yellow beetroot comes out with a yellow cake. Mmmm beetroot.