Rainbow Birthday Cake – My Family Ties

Rainbow Cake 

It was my daughter’s 15 th Birthday recently and I was faced with the task of making a special cake for her big day.  Every year I try to come up with a cake that my daughter’s will love and that is somehow special to them and this year I thought a rainbow cake would fit Siobhan’s birthday because she loves the different colours in rainbows.  

It is a bit of a time consuming cake and if you are making this in advance you can make the sponge layers the day before and wrap in cling film, and then it’s just a case of assembling the cake the next day.  To get the bright bold colours you need to use food colouring paste as it gives a more intense colour. 

When it came to cutting the cake we just didn’t have a knife big enough to cut neatly, so it all looked a little uneven, but tasted amazing.  So my tip for a cake of this size is to have a decent size knife to cut neat even slices, I will have to make sure that I do this next time.  

Siobhan loved the cake and the frosting too and had a brilliant birthday, and now I only have a year to think up what cake I am going to make for her sweet 16!


For The Sponge Cakes – (Makes 2)

  • 200 g butter at room temperature
  • 200 g caster sugar
  • 3 large eggs at room temperature
  • 205 g self-raising flour
  • 1.5 teaspoon vanilla extract or vanilla paste
  • 1 vanilla pod the seeds scraped off into a bowl and set aside
  • Food colouring paste 

For The Meringue Icing

  • 10 medium egg whites
  • 450 g golden caster sugar
  • 3 tablespoons cornflour
To Decorate
  • 500 ml double cream for whipping
  • Edible glitter
  • Edible confetti


  • In a food mixer add the butter and the sugar and beat until pale and creamy.
  • Add the vanilla seeds and extract and combine.
  • Beat the eggs and add gradually with the food mixer on a slow setting.
  • If you find it starts to curdle add a spoonful of the flour to the mixture.
  • Once the eggs are combined, add the flour gradually and mix thoroughly.
  • Add the food colouring, a little at a time using a toothpick or skewer, until the desired colour is reached.
  • Spoon into the cake tins and level, and bake for 35-40 minutes.
  • Remove from the oven and place on a wire rack to cool.
  • Repeat the steps until you have the desired amount of sponge layers.
  • Whip the cream to a spreading consistency.
  • Once you have baked and cooled all the layers of cake, place the first layer on a cake stand and spread the cream on with a palette knife.
  • Keep adding the cream until you have got to the top layer.
  • To make the meringue Icing  you need a clean bowl, whisk the egg whites until stiff peaks are formed.
  • Combine the caster sugar and the cornflour and add 1 tablespoon of the mixture to the whisked egg whites and continue to whisk until the mixture is thoroughly mixed, which will take only a few minutes.
  • With the food mixer on a low setting, slowly add the rest of the sugar and cornflour and mix until fully combined.
  • The meringue icing is ready to use straight away, spread over the cake with a palette knife and pipe all around the base of the cake for an attractive finish.
  • Add the edible glitter and the edible confetti and serve.

I hope you have enjoyed reading my recipe for Rainbow Cake, have you ever made a rainbow cake? I would love to know how it went and if you thought cutting the slices evenly was as tricky as it was for me! 
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  1. November 15, 2014 / 10:33 pm

    That cake looks amazing and you get super duper mum points for that! x

  2. November 16, 2014 / 12:50 am

    That looks amazing.

  3. November 16, 2014 / 7:02 am

    Looks great- i think my kids would like something like this

    • November 21, 2014 / 6:13 pm

      Thank you – my girls thought it was magical!

  4. November 17, 2014 / 1:43 am

    This cake looks amazing, my daughter would love it!

  5. November 21, 2014 / 8:39 pm

    Wow, wow, and wo. Fabulous cake x

  6. Caroline
    November 29, 2014 / 11:40 pm

    I've bookmarked this cake to try for my children's birthday, it looks amazing!!

    • January 11, 2015 / 4:44 pm

      Oh that's fab Caroline, let me know how you get on!

  7. January 3, 2015 / 10:05 pm

    This looks so good – i would love to be able to make this but would never manage!


    • January 11, 2015 / 4:45 pm

      Thanks so much, it's not as hard as you would think, it's just when you add the icing it's a little tricky!

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