Wikisimpsons - The Simpsons Wiki
Saturn Pies are a product made in the future.
The product is seen for sale at the Kwik-E-Mart along side a number of other products including Soylent Green, Soylent Brown, Moon Pies, Venus Pies, Venus-Maid Raisins, Hostess Fruit πs, and Infra-Red Vines.
 Behind the Laughter
Saturn Pies are a parody of Moon pies.