When you think about it, you could say that pies are powered by steam. The Cherry Watch Pie, by Jessica Leigh Clark-Bojin of Pies Are Awesome, not only runs on steam, but it’s made to look like it belongs in the science fiction sub-genre of steampunk.
A ‘how to’ tutorial can be found on the Pies Are Awesome YouTube channel. Be careful of steam burns.
[link, via Laughing Squid]