Donuts

Donuts are a circular pastry usually containing large amounts of fat. They are most notably Homer Simpson's favourite food. He can not live without them and doesn't like anyone else eating any of his donuts. They usually appear in the show pink-frosted with sprinkles.

History
In "Treehouse of Horror V", Homer changes the past and comes back to an alternate universe where his family is rich and happy, but when Marge does not know what a donut is, Homer goes back to the toaster to travel back through time again. However, when Homer leaves, it starts raining donuts. (Homer often panics when they are out of donuts.) In another Treehouse of Horror episode, Homer sells his soul for one. Marge wins the court case and Homer keeps his soul but his head is turned into a donut by Ned Flanders. In Lisa's Date with Density, Homer tries to fool Apu by putting variations of candy into a donut and trying to pass them off as sprinkles.

Non-canon

 * In The Simpsons: Tapped Out, donuts are used to speed up time and build things quicker.
 * In "The Simpsons Guy", the Griffin family are impressed upon noticing the donuts at the Kwik-E-Mart (while Stewie is surprised that his family doesn't know what donuts are). Despite the misfortune of their car missing, Apu refuses to give them any.  In response, Homer purchases them a box, while taking some for himself.

Trivia

 * You can buy Simpsons Donuts in many stores, including Donut King.