Moon peach

Moon peaches are a pale, round fruit resembling peaches. They may have been used as an ingredient in fruit pies, and are a favorite of Momo. Although a native fruit to the Air Nomad culture, moon peaches are seemingly native to Earth Kingdom territories as well, as suggested by Katara.

History
A moon peach was first seen when Momo laid out several fruits for Sokka. Before Sokka could eat the last moon peach, however, Momo jumped up and grabbed it right out of his hand, which caused Aang to name the lemur "Momo", meaning "peach" in Japanese. Moon peaches weren't mentioned again until Katara tried to reassure Appa when the animal was worried about Aang and Sokka.

Trivia

 * These peaches also appear in the video game, Avatar: The Last Airbender. During Team Avatar's time at a village located in an Earth Kingdom forest, Momo must be used to search for blue trees and locate six moon peaches, with which to feed a hungry Appa.