Rainbow cake

Rainbow cake

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(80 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 made when lactic-acid producing bacteria are added to cream and churned to make an…

    • 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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    skidge
    31st Mar, 2013
    1.05
    I tried this as an Easter project, and was very disappointed with the icing. The cakes also seemed quite flat, and I don't usually have problems with sponges. The icing, despite very minimal mixing, was far too runny, and slid down the sides. Buttercream may work better. I also agree that the Dr Oketer colours are not brilliant.
    joannelthomson
    31st Mar, 2013
    3.05
    I used Wilton concentrated colouring paste from Steamer Trading - very expensive but I only had to use a little so they will last ages. Despite a disaster with the icing (really running despite minimal mixing - possibly the cheese I bought?) the cake looked great and won me the best looking cake title in a Comic Relief bake-off. However, I didn't think it tasted amazing - dense and not masses of flavour in the cake itself. So if you want something that tastes delicious, I wouldn't recommend this bake, but for showiness, not much can beat it.
    hairymammoth
    30th Mar, 2013
    4.05
    I made this for my daughter's birthday and the children loved it. In fact I love it too - the rainbow colours look amazing. To reply to the previous commenter, I had no problem with the cakes rising, cooking at the temperature in the recipe. However, can I just say that there is no point trying to make this with Dr Oetker food colouring - it's just not strong enough. I know this because I tried it, and the cakes just looked washed out and tasted odd because I'd used a whole pot of food colouring! So after a panic and few tears I then went out and bought the expensive stuff which gives the effect you see in the picture above. So, in conclusion, this is an expensive cake to make (about £18 on food colouring alone) but it does look beautiful, and all the local children will be talking about your amazing baking for days to come!
    oo03par
    29th Mar, 2013
    2.05
    Tried this from the magazine. Unfortunately the temperature of the oven was far too low - cakes didn't rise, and consequently didn't taste very nice. I've not tried the correct temperature above, as i don't really want to waste another batch of ingredients. Oh and you'll need a lot of colouring to get vibrant shades, as the colour cooks down lighter in the bake.

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