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My Rainbow Cake Recipe

June 13, 2011 18 Comments Filed Under: Food, Recipes, Uncategorized

Colourful crumbs…
Short stack!
Rainbow Cake
530g of sifted plain flour
1 tsp of salt
230g of unsalted butter (room temperature)
600g of caster sugar
4 large eggs
A few drops of vanilla extract
480ml of buttermilk or yoghurt mixed with a little creme fraiche
2 tspn white wine vinegar
2 tspn baking soda
Food colouring in various colours, preferably gel or powder
Icing:
450g of full fat cream cheese
500g of Mascarpone
A few drops of vanilla extract
240g of icing sugar
600ml of double cream, whipped
You need sponge cake tins for this recipe. I only have two so I baked two layers at a time but if you have more, even better!
Sift together flour and salt in a bowl.
In your mixer beat the butter until whipped. It should be spread fluffily around the sides of your mixing bowl.
Then add the sugar and beat for at least 2 minutes.
Whisk the eggs together and add in a slow trickle to the mixture while it is being whisked. Add a teaspoon or two of flour at the same time. You want to try to prevent curdling which makes a dent in your sponge.
Every so often, stop the mixer and scrape down the sides. The mixture should look pale and airy.
Then take the flour and the buttermilk/yoghurt and add alternately to your mixture ending with the flour.
In another bowl mix the vinegar and baking soda together and add to the main mixture.
So now you have your sponge batter.
Take your buttered and floured sponge tins and some bowls.
Divide the mixture between the bowls. If you are really swotty you will do this evenly but I wanted thicker layers at the bottom of the cake, thinner at the top.
Stir your chosen food colouring into each bowl. To make more colours, mix your food colouring eg red and blue make violet, some yellow in the green gives you a different shade of green. Using powdered food colouring means that perhaps the sponge batter is more stable without the extra liquid. You can play with the colours like paint pots. Really fun to do with the kids!
You could also add food flavouring such as lemon essence for the yellow layer, orange essence for the orange layer, mint essence for the green, almond essence for a pale green, chocolate powder for the brown.
Pour the mixture into your cake tins and bake in a pre-heated medium oven, 180 C, until firm, about 15 minutes. In the Aga, I baked the sponges on the top shelf of the baking oven. (You could also use the bottom shelf of the roasting oven with a cold shelf if you have a 2 oven Aga). Put a skewer in the sponge and if it comes out clean, it’s cooked.
The layers are thinner than a normal sponge sandwich so use a fish slice or something to turn out the sponge tins onto a rack. Let cool for a couple of minutes then cover to prevent drying out.
While all your layers are cooling, make the icing. The Rainbow cake recipe from Whisk Kid uses a lemon meringue icing but every time I try this, it curdles! So I used a cream cheese icing instead.
Beat the cream cheese and the mascarpone together. Add the vanilla and the icing sugar. Add the whisked double cream.
Assemble the layers one by one in the order of your choice, spreading a layer of the cream cheese icing in between each layer. Then with a palette knife, spread the rest of the icing all around the cake, completely covering the top and sides with a thick layer. I sprinkled some ‘disco’ white glitter on top.
Fantastic for kid’s parties: you could even cover the top with Smarties. This blogger got her kid to doodle on the white surface with edible ink pens.
For a patriotic cake, see my Royal Wedding red, white and blue cake.

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Comments

  1. laundryetc

    June 13, 2011 at 8:09 am

    Tis a truly amazing sight to behold. Is the mixture the full amount to divide for all of the layers? And if you are baking just 2 layers at a time, will the mixture just wait in between times for it own curtain call? Really fabulous.

    Reply
  2. theundergroundrestaurant

    June 13, 2011 at 8:12 am

    Yes the mixture is the full amount. I found the batter waited between cooking each batch of layers with no problem!

    Reply
  3. Kate@katescakesandbakes

    June 13, 2011 at 8:21 am

    Brilliant- an absolutely gloriously, fun cake! The cakes (without icing) would freeze well? Although, to be fair, I doubt very much this cake stays around long enough to be frozen!

    Reply
  4. theundergroundrestaurant

    June 13, 2011 at 8:30 am

    I've never frozen a cake, Kate. But if others freeze ok, I guess this will too.

    Reply
  5. Campari & Soda 楊靜安

    June 13, 2011 at 9:23 am

    incredible! will have to go out and get some sponge cake tins now! ITs so pretty 🙂

    Reply
  6. Anonymous

    June 13, 2011 at 9:59 am

    Wow really fab!!

    Reply
  7. Gin and Crumpets

    June 13, 2011 at 10:39 am

    Brilliant – I love it!

    Reply
  8. london bakes

    June 13, 2011 at 11:04 am

    I love this cake! The colours are amazing and I love the surprise you get when you cut into it. I'm just trying to think of an excuse now to bake it…does the fact that it's Monday count?!

    Reply
  9. Daily Morning Coffee

    June 13, 2011 at 12:28 pm

    Wow!!! It looks so nice. Also sounds yummy. Thanks for sharing the recipe. I will surely try this out.

    Take the Cake Personality Test and find out which cake are you like. I have taken the test and have enjoyed a lot. Hope you too will enjoy it. Have Fun!!

    Reply
  10. The Curious Cat

    June 13, 2011 at 3:02 pm

    I love it! So inventive! xxx

    Reply
  11. rachelle

    June 13, 2011 at 6:40 pm

    this is soo fabulous can't wait to bake my own

    Reply
  12. Shaheen

    June 14, 2011 at 6:29 pm

    Absolutely fabulous!

    I've been wanting to make rainbow cake for a long, long time. I am due to be moving to family in the next two months, so will have the perfect excuse.

    Reply
  13. aoife@myhome

    June 14, 2011 at 9:34 pm

    this is amazing. I'm off to the Edinburgh cake club on the 19 July… you've inspired me. A x

    Reply
  14. Chiswick Dinners

    June 20, 2011 at 4:03 pm

    Hi Kirsten, if your meringue buttercream curdles try chilling it briefly and then beating it for another few minutes. I underestimated how much beating it takes for it to come together at first, but it has a gorgeous silky consistency so is worth persevering with.

    Reply
  15. nickieb

    August 23, 2011 at 3:34 pm

    fab cake got kids to help and they thought it was magic, looks very special for not too much effort

    Reply
  16. Anonymous

    September 5, 2011 at 12:59 pm

    Amazing! It tastes great and looks really cool. Thank you!

    Reply
  17. An Open Book

    February 8, 2013 at 11:32 am

    hi kristen,..thanks for that comment on my blog, but i have credited (and always will) the source. I followed bakerellas recipe n the link leads to her site.

    Cheers
    Nisha

    Reply
  18. Anonymous

    October 14, 2013 at 3:22 pm

    Looks horrible, sorry..

    Reply

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MsMarmiteLover aka Kerstin Rodgers.

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