Hemispherical Earth cake with crust, mantle and core

This brilliant hemispherical cake depicting the Earth's surface and approximating its core was baked by Rhiannon of Baking Adventures in Melbourne, Australia. She baked a cake inside a cake, formed a crust of chocolate buttercream, and then applied the seas, continents and islands with marshmallow 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.

Commission: Earth Structural Layer Cake (via Geekologie)


  1. But does it taste good?   I’ve had some bad experiences with these sculptural cakes — they look much better than they taste.   Too much fondant can make you wish they used plaster instead of sugar.

    1. Ain’t that the truth.  I’d just as soon eat play-doe than that fondant putty crap. Still, it’s a nice piece of work…I wouldn’t eat it…but it looks cool.

      1.  It’s marshmallow fondant, according to the post. So it’s basically melted, coloured and reset marshmallows. Sounds pretty good to me.

  2. FAIL!  Doesn’t conform to the hydroplate theory.  Should be filled with a layer of liquid goodness.

    1. Hydroplate theory is a creationist thing which purports that there were  enormous pockets of water above the mantle. Parts of the planet-encasing supercontinent above the water pockets collapsed, forming the oceans and causing the biblical flood. Please don’t make a cake like that.

      You can have some liquid in there, though, because the outer crust is liquidy (custard, most likely), and you could do several layers of different-colored frosting to emulate the upper mantle (parts of which are solid but ductilely deforming, like dense frosting but certainly not like liquid) and the crust.

    2. And what, are they going to need to put a jaw breaker in the middle too?  It’s a hemispherically layered cake for goodness sakes, not a pudding pie! 

      On a unrelated side note, should we also be worried about the proliferation of yellow cake?

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