How to make the Best Ever Rainbow Cake

There isn’t a person on earth who isn’t a fan of rainbows, right? Right?? Well, if there is then they must be very sad and lonely. But you and I know that rainbows are magical and brilliant and what better way to give the rainbow the respect it deserves than to embody it in cake form.
This one's quite a lengthy watch, so put the kettle on, put your feet up and prepare for some top tips for baking and decorating the perfect Rainbow Cake. This video is going to knock your socks off!


For the cake -
9 tbsp whole milk
1 ½ tsp vanilla extract
Various colour pastes (red, orange, yellow, green, blue & purple)
750g soft unsalted butter
750g caster sugar
9 large free-range eggs
750g sifted self-raising flour
Butter & flour for preparing the cake tins
For the buttercream -
400g soft unsalted butter
900g sifted icing sugar
5-6 tbs whole milk
½ tsp vanilla extract

Video By CupcakeJemma

Comments (3)


thank you. Are you certain about the 750 grams of butter? that's about 3 large cups.  but heck why not ;0



I've made this recipe several times (and gf'd it too) and it's excellent. Yes it's 750g butter and sugar.. My only issue is; uk legislation re food colouring (yet again and sorry for keep banging on about it..!) But you can see here precisely what we have to deal with. Those grey edges are a nightmare as are the wasted cake. Makes me so jealous to see your easy rainbow cakage... but then- I rather my kids weren't hyperactive I suppose. 


well, what can I say!

I made it, it looked and tasted wonderful. Thanks so much.

No cake wasted - the cutoffs make great truffle balls  when crumbled and mixed with melted chocolate.

 Add little nut pieces to the mix. or dried fruit.

Make little balls.

Roll them in dedicated coconut. or grated chocolate.

  You can also pop them on to lollipop sticks for a pretty display.

Stick them in the fridge to firm up. 

Love and blessings, Paula.