Lychee nut

Leechi Nuts are a type of fruit native to the World of Avatar. They are reddish brown in color, and are known for their abundance and taste. Their fruit, or possibly their leaves, can be used to make tea, as they were mentioned by Zuko whilst he was working at the Jasmine Dragon in Ba Sing Se. Leechi Nuts are known to grow in the Earth Kingdom and are suspected to grow in the Air Temples, as Momo demonstrates a great liking for them. Leechi nuts were often used as bait for traps to catch small animals.

Connection
Leechi Nuts are also a fruit in our world, more commonly known by their proper name, "Lychee" and native to southern China. They are nuts only in name, as they have a blunt, spiky rind covering the outside, making them more similar to a berry of some kind. It contains inedible seeds separated by white, delicate grape-like pulp. It is unclear whether or not Leechi Nuts in the World of Avatar are in fact nuts or berries like their real-world counterparts.