"...it is nonetheless very unusual, especially the slimy edible part that superficially resembles an eyeball preserved in formalin. The fruits are roughly the size and shape of "jumbo" olives, about one inch (2.5 cm) long, with a thin, leathery outer covering. The outer skin peels easily, exposing a translucent, slimy ball containing a large, shiny black seed. It is this juicy, slimy mass surrounding the seed (referred to by some authors as an aril) that is slightly sweet and edible. The fruits, which hang in grape-like clusters, are yellowish-red to brown at maturity...."
If i read this.. I would never guess they referring to longans.
http://waynesword.palomar.edu/plnov96.htm
