Maybe the cake is actually a space ship! I am impressed that they made this so soon after the episode came out, but I can't help but wonder if the sand and rocks are some kind of candy.
This cake is actually a couple years old. It was on the show Amazing Cakes a few years ago :)
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The sand looks like brown sugar or maybe cinnamon and the rocks are jelly beans.
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Dinosaurs On A Spaceship is not the only Doctor Who episode to feature dinosaurs. This cake is likely based on the 3rd Doctor serial Invasion of the Dinosaurs.
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