Most of us know the story behind the seasons in Greek Mythology, but just to recap...
Hades kidnapped the daughter of Demeter, Persephone. Demeter went in search for her, lead by Hecate's torches. She let the cosmos (land of humans) waste away untended and without fertility. Eventually, Demeter is told by Helios that he daughter was taken by the King of the Underworld. She threatens Zeus that if her daughter is not returned, she will forever leave the cosmos to waste (meaning no more humans to give offerings to the gods). Zeus then sends the emissary, Hermes, to go to the Underworld and see Persephone back.
Meanwhile, in the Underworld, Persephone is offered some pomegranate and she eats one third (three seeds, half, it varies) of the pomegranate. Eating the food of the Underworld bound her to the Underworld. But a compromise was made that Persephone would spent a third of the year (others say half) with Hades and the other time with her mother.
Is there another myth that has someone eating Underworld food?