Wednesday, September 7, 2011

Grandma Cake's 80th Birthday Rainbow Cake

I've spent the last few days in Christchurch as my Grandma turned 80 last week so had her birthday party on Sunday. I am often on cake duty for family birthdays, and try to make something that suits the person - however I can work that in. Grandma Cake is a very sunny, happy person and loves bright and cheerful things, and she also loves the garden and flowers (which kind of fit into the bright-and-cheerful category, but stay with me here).

I remembered seeing somewhere in the universe of the internet a rainbow cake - actually, in the realm of Pinterest (which is scarily addictive - don't click through unless you have too much time on your hands!) there are a huge number of rainbow foods. I'm not a huge fan of excessive food colouring, but sometimes the occasion calls for it, and using gel colours you don't need all that much to get a pretty intense colour. You can get gel colours from most cake decorating stores (like Kiwi Cakes) and a pottle will last ages.

To produce a rainbow of cake, choose a light-coloured batter (I made an orange cake recipe, though I thought it was too dry cooked in thin layers so I won't share the recipe - lemon yoghurt cake would work well). Work out how much batter you need - each layer should be a couple of centimetres thick - and divide it into seven. I made such a large cake (and actually I made a second cake, as there were 150 people at the birthday party) that I made a batch for each layer. Then use gel colours to dye the batter before baking - start with a little and add more until you like the colour. You only need red, yellow and blue colour - red and yellow make orange; blue and yellow make green (though I had green colour so used that) and blue and purple make indigo.

Because the layers are quite thin they cook quickly. The layers for my 30cm cake took about 15 minutes each - the smaller 25cm cake only took about 10. Once cooked and cooled you'll want to trim the tops to make each layer nice and flat. You'll end up with a very colourful bowl of cake scraps. Which you can then feed to your six-month-old nephew, though I can't guarantee they'll impress him:

(also: don't do this unless you're prepared to clean up a lot of mess!)

When the layers are flattish spread a thin layer of icing (anything firm enough to hold - I used a basic buttercream) on each - you don't want too much as it'll detract from the colour, just enough to hold the layers of cake together. I think it looks better with the darker colours at the bottom, so started with violet, building all the way up to red. When they're stacked apply some pressure on top to ensure they're nicely stuck together (sort of smush them down, but not too heavily!) and then ice around the sides, filling in any gaps. I did a thin coat of icing and then covered the cake in these cool (and amazingly easy) roses (you use the Wilton 1M/large open star tip and just pipe swirls from the inside out - I'll write more about this sometime, but I didn't get pictures as by the time I got to this part I was pressed for time!).   

I was going for the ultimate deception - see how grown-up it looks? And sort of fits with the whole garden thing for Grandma. The most suspicious thing about the cake was its height - you can see below that it swallowed the whole blade of the knife when cut - those layers do add up!

Grandma was a little confused when we told her she had to cut a wedge - I think she thought we were going to make her eat a huge piece of it! It had the desired effect, though - see her face in the photo on the right! And the whole room gasped with delight when she lifted the slice - audible appreciation definitely massages the ego of the baker, and on the impressing-the-audience scale it possibly even beats my uncle's party trick of eating birthday candles to amuse small children. ;-) 

So; a great cake to make to impress; reasonably low effort, just takes a while to bake the layers. Grandma loved it, and had a ball at her party too - many family and friends, and lots of little children to liven things up. It was a stunning day (I guess the weather was trying to live up to Grandpa's party back in February, when it got to 36 degrees!) and it was nice catching up with everyone and gorging on sugar.

What's the best birthday party trick you've seen?


  1. Rosa, the cake looks fabulous! And I especially like the look on Grandma Cake's face when the rainbow of colour was revealed.

    I think those roses would look great on a wedding cake. Great stuff!

  2. Gorgeous! Such beautiful work Rosa, I bet she loved it. Inspiring!

  3. The cake was amazing! and tasted good too. It was the best type of cake you could have ever made for your Grandma..

  4. Rosa, what a glorious cake! I love the photo with your grandmother's suprised face. The cake is beautiful anyway from the outside - that piping is amazing! - but all those coloured layers really make it. Am very inspired :)

  5. Baby cake may have rejected the scraps but they soon vanished into other members of the cake family...I have not heard one other person suggest the cake was dry - texture was fine for this cake, the 48 eggs ensured it was really just an extra special sponge cake. Pedantically speaking, a gorgeous cake!

  6. Beautiful! Well done you! I love the look on Grandma Cake's face when she cut into it. The outside is impressive enough without even thinking about the unexpected and equally impressive inside. Your family is very lucky to have you as the chief cake maker

  7. WOW!!! That looks stunning!!! You are very talented and I wish I could decorate as well as you!!!!

  8. That cake's fantastic! Grinned when I saw your gran's reaction, very cool.

    You will definitely have to post on how to do the decoration roses, the colouring is great too.

  9. Ive seen these cakes quite a bit recently but I think Youve added the best touvh with the rose shaped icing. Me Likie!

  10. Absolutely fantastic cake. I have been eyeing these up for a while now I feel even more inspired! Megan

  11. Love this, I have been wanting to do a rainbow cake for a while now, might have to do it for the next thing that comes up :)

  12. Wow! I have never seen a rainbow cake,I'm seriously impressed.I am intrigued with the way you have managed to get the swirls of colour into the icing,so hope you will soon post on that.Finally,Grandma looks great at 80,I bet she had a ball.

  13. You will treasure this photo in years to come.

  14. Rosa, that is INCREDIBLE - you are so the queen of baking. Good tip about food colouring too. I SO want to make this now... can you post about the icing soon please?

  15. Kaz, thanks! The roses would be a great wedding touch, wouldn't they?

    Jemma, thanks, and thanks for the shout out yesterday on your blog too!

    Stephen, glad you enjoyed it. :-)

    Mum, I don't know, a touch of syrup might have made it better... But okay. :-)

    Kate, thanks, it's fun making cakes for your near and dear because you know what they'll enjoy. :-)

    Kimberley, I promise it's easier than it looks. ;-)

    Katernz, I'll try to do a tutorial in the next couple of weeks - it's amazingly simple.

    Jacksta, thanks, I wanted to mix it up a bit, and like the contrast of the demure roses and vivid rainbow.

    Megan, go for it! The delight of those eating it makes it well worthwhile.

    Kat, seize any excuse you can find. :-)

    Cheryl, Grandma definitely enjoyed her party! I will post on the icing soon, stay tuned. :-)

    Delaney, thanks!

    Daleaway, I will!

    Lucy, I'll do the icing post as soon as I can. :-)

  16. I love the the look on your grandma's cake. Her yellow cape is wonderful too. Great job!

  17. Totally & utterly fabulous! Love, love the surprise rainbow hiding inside.

  18. Totally & utterly fabulous! Love, love the surprise rainbow hiding inside.

  19. That is a work of genius:) Your Grandma's face is a picture, what a gift, well done! Baking as sheer fabulousness......

  20. Gorgeous inside and out, and what special memories you're helping to create for your family.

    Thanks again for allowing the chocolate links. Rachael

  21. What a fantastic cake! And what a fantastic look of surprise she had!

  22. bunnyeatsdesign, I'm so pleased she got so much enjoyment out of it!

    Mairi, thanks. :-)

    Plum Kitchen, thank you!

    Rachael, I hope so, memories are so important. :-) And no problem!

    moonovermartinborough, yes, love the wide-open mouth. :-) Definitely a winner in the impact category!

  23. Briliant cake and really made the day - you hit exactly the right mark. Great day had by all and to see the joy on 'Grandmas' face made it all worth while. Well doe on another masterpiece.

  24. joolzmac, thanks!

    Deb, so glad you could come, was lovely to see you. :-)

  25. How incredible! And the roses are so delightful that I Pinterested the photo for wedding cake ideas :)

    I did tell you


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