Earth Structural Layer Cake

A little while ago, my sister approached me with an idea. She’s doing an education degree, and her and her friends had to give a series of lessons on the geological sciences to a class of primary school kids. One of their lessons involved teaching the kids about the structure of the Earth. One of her friends came up with the idea of presenting a model of the Earth made out of cake. So my sister asked me if I could make a spherical cake with all the layers of the Earth inside it.

I told her I couldn’t do it. “How do you get a sphere inside a sphere inside a sphere?” I recall saying. “Oh yeah,” she replied, realising what it would involve.

I spent the rest of the afternoon thinking about it. I don’t admit defeat. Ever. But especially not with cake. Nothing is impossible is pretty much my baking motto, so to say this cake was impossible left me feeling weird. There had to be a way. A way that didn’t involve carving or crumbing the cake. I kept mulling it over until I had a breakthrough.

There was a better way of doing this that I came up with, but I needed a set of hemisphere tins to pull it off. I didn’t have the equipment, nor the funds to purchase it, so I had to come up with a plan B. Somehow I went from “it’s impossible” to having multiple ideas. Go figure.

Plan B involved baking a cake inside a cake inside a cake. And crossing all fingers and toes and hoping it worked.

Looking pretty promising so far.

There weren’t enough people to warrant a complete sphere, so we went with a hemisphere globe instead. With the inner core, outer core and mantle all cake-d up, it was time for the crust. Chocolate buttercream filled that role.

The rest was left up to marshmallow fondant.

Depictions of the globe, satellite pictures of the Earth, movies… they almost always seem to show the globe featuring America smack bang in the middle. I’m always surprised and excited to see it any other way. So this time I let my home country by the focal point of the cake, and based everything else around it. America still got a little peep around the side.

I added a little white and marbled it into the fondant to make some clouds. I hand cut all the continents from fondant, then painted them with a gel paste mixture using a dry brush technique. This process all up took me about 6 hours and was the most arduous process. Coupled by the fact I was using the world’s tiniest brush. But I think the different colours makes it look much better than if I’d have used plain green fondant.

When I started this cake I was determined for pin-point accuracy. I was going to make every country and every island so damn accurate a pilot could use it as their navigation system. But by the time I got to Europe, it was more like, “Yeah, that’s the general shape.”  By the time I got to the Americas I was wondering if that continent was even necessary. I missed a whole heap of islands above Australia and settled instead for the main ones. Cutting out the countries wasn’t that cake walk I’d imagined it to be.

I finally got to a finished look for the cake and let my sister take it off my hands. She brought me back a slice so I could share a picture of the inside with you all. The red layer is orange Madeira sponge, the yellow is lemon Madeira sponge and the white cake was a vanilla buttercake.

And one of her friends sent me some pictures of their cutting out the cake.

It wasn’t an image of perfection, but I was just relieved that the layers were there. I ran into a lot of trouble with the yellow layer simply through this being one large experiment, so I was expecting it to be a mish mash of terrible proportions.

I’d definitely change a few things next time I tried it. I’d especially love to try the Plan A version of it one day, for that would allow toe possibility of using more moist cake recipes.

I’m told the cake was a massive hit with all the staff and students, so that was definitely a relief!

ETA: Tutorial for making a concentrically layered cake is now here.


170 thoughts on “Earth Structural Layer Cake

  1. I love your creativity! Nice that you let yourself be challenged and came up with something so original. Thank you and greetings from baking and pie country (south) Germany

  2. I love it! If I may ask do you put the yellow batter first? then the core then the red and bake it? Or do you bake it first then bake the red Or…thanks!:) Im planning to make this and I am lost 🙂 thank you I am a hobby baker also but if you can help me please email me 🙂 thanks!:)

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  5. WOW! I’m making my own which I think mine is a little small and since I’m doing the whole globe its harder but i know i can do it and now I feel how much work and pain you put into it.LOVE IT!!! send the pic to you later!~Sara

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  7. fantastic! I’m planning on making something similar for my children, though I will take the lazy way out and have Pangea 😛 Many years ago I made a world map rectangular cake and each continent was done with different coloured sprinkles. It kiiiiilled me and I said never again. Unless it’s a Pangea cake 😉

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  13. Fantastic! As a Geographer this appeals to my scientific appetite as well as my digestive one! Amazing accuracy in all the land masses – huge amount of respect to you 🙂

  14. I am in LOVE!!!! My 6th grader is in need of extra points in science and i was gonna do the same thing you did with rice crispy treats and fondant. The cake looks fun and the kids can eat it afterwards. Can you do a video for this cake like the one you did for Jupiter?

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  16. I want to try this with my son for some BADLY needed extra credit. How long did it take you from start to finish? Can boxed cake mix be used or do you think pound cake batter is best?

  17. the tutorial is for the Jupiter cake though do you think it would be possible to make a full tutorial just for the earth one??? thank you for your cake it has inspired me 🙂

  18. Thank you so much for the inspiration and the tutorial! I had a go at it and combined Earth with the earth observation satellites that I work with.( Everybody loved it and I’m giving the compliments back to you, who thought up the great plan to bake the spheres within each other. Thank you, and your cakes are so amazing (I didn’t want to do Jupiter because I thought I would not be able to reach your level of perfection). Cheers, Nadine

  19. Hi, I can’t find the tutorial for the half earth cake. I can only find the tutorial for the spherical Jupiter cake. Please help!


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  22. You said the process for the Jupiter and Earth cakes is the same but aren’t the ingredients, recipe, and even the number of layers different? If not, how do change the color to make it like the Earth cake?

  23. Hi! I’m making this cake for my English class at school and I’m not sure how to cut out the continents. I’ve tried cutting out continents on paper and then tracing them with a knife on to the icing but the paper sticks to the icing and I can’t get it off! How did you trace the shape of the continents? Thanks!!

    • I actully did it eexactly as you described! The fondant shouldn’t be that sticky – perhaps try dusting it with cornflour so it’s not so tacky. Or you could leave it to dry in the air a little before cutting the shapes out.

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    • Very belated reply. But yeah, that’s an awkward situation. It was brought to my attention recently and it’s disappointing. Especially since I know for a fact she is aware of my blog because she has used my recipes before (with credit). There’s little I can do about it save be salty about how much revenue she’s made off of my ideas. Oh well!

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  30. Hi, I want to know one thing. If you put that cooked cake into another mixture, will it be rather tough? I mean that cake in the middle because it will be cooked 2 times.
    Thank you 🙂

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