They all seek the Tesseract for it's a source of unlimited sweetness.
Imagine waking up on Sunday morning after a super fun night out on the town for your friend's birthday. You're exhausted, you're sore, your voice is hoarse from proclamations of merriment, your hair smells funny and you still have one sock on. Now imagine that this donut appears on your nightstand. Feeling a bit better now? I thought so.
When I was a kid my mom had a cookbook all about how to make creative cakes with nothing but a round cake pan, a bundt pan and a square pan. She made caterpillars and castles and Snoopy and all sorts of amazing creations but I don't think I ever saw a donut. It's so simple it just slipped under the radar.