Freelance mathematical sculptor and designer George W. Hart likes to play with his food. Just take a look at his "Mobius" bagel, a play on the eponymous scientific concept of a surface with only one side and only one boundary component.
The bagel itself isn't actually a Mobius strip. It's rather made with two strips, which are the cutting surfaces; one for each half. Hart's website has detailed instructions for how to make your own, as well as other foodie-math projects. He also teaches how to turn a bagel into a trefoil knot (that's when two loose ends of a common overhand knot are joined), how to make cookies that look like trilobites (a fossil group of extinct marine arthropods) and the mathematics behind impossible food combinations.
In an interview with HuffPost, Hart described the simit, a popular Turkish bread baked in a circle and covered in sesame seeds. He first learned about it from Nathan Myhrvold, Microsoft's former chief technology officer.
For your geek food readers, I should also mention that when I showed Nathan Myhrvold the linked bagel cut, he told me about simit, which I hadn't encountered before. I found a simit bakery in NY, and as Nathan predicted, it is great for doing the linked cut.
Click through the below gallery and video for Hart's step-by-step guides to making your own "Mobius"-esque bagel.