Rainbow cake

Rainbow cake

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(138 ratings)

Prep: 2 hrs Cook: 1 hr

A challenge

Cuts into 18 slices
A stunning celebration cake of six or seven colourful layers and cream cheese frosting - an impressive showstopper.

Nutrition and extra info

  • Freeze un-iced sponges only

Nutrition: per slice

  • kcal601
  • fat29g
  • saturates18g
  • carbs73g
  • sugars47g
  • fibre2g
  • protein11g
  • salt0.6g
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Ingredients

    You'll need 3 x these ingredients for six sponges

    • 125g butter, softened, plus a little extra for greasing
      Butter

      Butter

      butt-err

      Butter is a dairy product made from separating whole milk or cream into fat and…

    • 225g plain flour
    • 150g golden caster sugar
    • 3 medium eggs (very important to use the correct size)
    • 1 tsp baking powder
      Baking powder

      Baking powder

      bay-king pow-dah

      Baking powder is a raising agent that is commonly used in cake-making. It is made from an alkali…

    • pinch of salt
    • 1 tsp vanilla extract
    • edible food colouring - red, orange, yellow, green, blue and purple, plus optional pink (see below)

    For the icing

    • 1 tsp vanilla extract
    • 3 x 250g tubs cream cheese or mascarpone
    • 350g icing sugar

    Method

    1. Heat oven to 180C/160C fan/gas 4. Grease 2 x 20cm round sandwich tins and line the bases with baking parchment. Tip all the sponge ingredients, apart from the food colouring, into a mixing bowl, then beat with an electric whisk until smooth.

    2. Working quickly, weigh the mixture into another bowl to work out the total weight, then weigh exactly half the mixture back into the mixing bowl. Pick 2 of your colours and stir a little into each mix. Keep going until you are happy with the colour – the colour of the batter now will be very similar to the finished cake, so be brave! Scrape the different batters into the tins, trying to spread and smooth as much as possible – but try not to waste a drop of the batter – a rubber spatula will help you. Bake on the same oven shelf for 12 mins until a skewer poked into the middle comes out clean.

    3. Gently turn the cakes out onto a wire rack to cool. Wash the tins and bowls thoroughly, and start again from step 1 – this time using another 2 colours. Unless you’re making the optional pink layer, repeat one more time to get 6 sponges, all of different colours. Leave them all to cool.

    4. To make the icing, very briefly beat the vanilla and cream cheese or mascarpone with an electric whisk until smooth. Sift in the icing sugar and gently fold in with a spatula. Be careful – the more you work it, the runnier it will get, increasing the chance of splitting.

    5. Smear a little icing on your cake stand or plate – just a splodge to stick the first sponge. Start with the red, then spread with some icing right to the very edge. Repeat, sandwiching on top the orange, yellow, green, blue and finally purple sponges. Spread the remaining icing thickly all over the sides and top of the cake. For more tips and expert advice on how to create the perfect rainbow cake, check out our tips, below.

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    Comments, questions and tips

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    EJChocolate
    27th Oct, 2016
    4.05
    Before making this cake, I looked at the comments and lots of people were saying that I shouldn't do the cream cheese frosting, so I made a white chocolate ganache instead to cover and sandwich the cake layers together. I made it by following this simple recipe; Ingredients: 600g white chocolate 300ml pouring cream Method: Break up the white chocolate as small as possible, with your fingers or a knife. Then put the cream in a saucepan and cook over a low heat. When the cream begins to boil, turn the heat off and stir the white chocolate untill it's smooth. Cover with cling film and leave in the fridge over night. The next day, put it in the microwave for 1.5 mins (or until its spreadable) and cover your cake! Going back to this cake recipe, everyone really enjoyed the overall appearance of the cake. The only other thing I changed with the recipe was that I cooked each layer for 20- 25 mins rather than 12 mins. I gave this recipe 4 stars because the cake was rather dense.
    sophieredican
    1st Aug, 2016
    My first practice run at his cake for my step-daughters 18th birthday was not very good so I bought the gel food colourings and used a Victoria sponge recipe instead. Considering it was also gluten free it came out perfectly. To make the cream cheese icing more robust I added butter. In the end it was perfect and everyone loved it and said how tasty it was. I would definitely recommend using the gel colourings not the liquid ones as they taste horrible (and the sponge will turn out a little less dense) and adding butter to the icing.
    jfn1
    4th Jul, 2016
    3.05
    My daughter had insisted on a rainbow cake and although the sponge works well, I would avoid the cream cheese icing. The teens I served this too were not impressed with a cake that smelt of cheese! No amount of icing sugar will hide it and the outside will not look like the picture. I would advise that you use butter icing instead.
    sophieredican
    1st Aug, 2016
    If you add butter to the cream cheese icing it comes out much tastier, more robust and doesn't smell so strongly of cheese!!!
    Niamhfoy
    5th May, 2016
    4.05
    I made this for my little girls 3rd birthday and it was fab! I was initially worried that the cakes were too dense and flat but it worked out so well when they were stacked up and iced. It's a real 'Wow' cake. She's already looking for it for her 4th birthday!
    helenhomespun
    16th Apr, 2016
    5.05
    Absolutely brilliant. Have made three times now - once for my daughter's birthday as written and then twice more as ombre cakes with gradations of pink colour... Used Wilton paste colours and iced with buttercream. Great technique is making them in pairs and freezing wrapped in cling film as you can get them all out the night before the event to speedily ice and you're away. Can't speak highly enough - follow to the letter and you'll be delighted!
    hannahmolloy
    31st Jan, 2016
    3.05
    The cakes were really good but the icing was awful. We followed the recipe and it was far too runny and wouldn't spread over the cake so we had to make a last minute run to the shop to get some fondant icing. I'd completely recommend finding a separate icing recipe.
    sophieredican
    1st Aug, 2016
    If you add butter to the cream cheese icing it makes it more robust and much tastier.
    Beveli
    25th Jan, 2016
    After reading some reviews I was scared, but I wanted to make this cake for my daughters 4 th birthday rainbow party and being a denser cake it was the only option in creating a really tall cake. And it was amazing. I did a test run initially weeks back and did the half measure but it was too fidly as thicker batter and even though I measured perfectly they came out uneven so I opted to make them individually using two thirds of the mixture (83g butter, 150 g flour, 100 g caster sugar, 2 eggs, two thirds teaspoon of baking powder and vanilla, still a pinch of salt). Made them over 2 nights, froze all of them and bought them out the day before for icing. Just needed to cut a little of the top to even it out. Cream cheese Icing was the correct amount however I only used a little in between as you need a lot to hide over the top and sides to hide the colours. I'm in oz so it was a very hot day so kept icing in fridge to keep cool and workable whilst icing. Using this amount though it is a huge tall cake, however everyone loved it. And the effect of the colours was amazing (used queen gel and you only need a couple drops which doesn't alter taste at all) Cut it into 2cm by 2cm pieces vertical and stuck a skewer stick down the middle for the kids so everyone got to have all the colours.
    Louise Campbell
    16th Jan, 2016
    5.05
    I just made this for my daughter's birthday and decorated with rainbows and my little ponies. Thank you to everyone for their comments. I froze the cakes before icing them and made an icing with 2 packs of butter, icing sugar and a tub of marscarpone (which was delicious). I thought the cakes tasted great and I got lots of compliments!

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