Melicoccus bijugatus is Guaya Cubana

Melicoccus bijugatus, commonly called Spanish lime, genip, guinep, genipe, quenepa, mamoncillo, or honeyberry,or guaya cubana in spanish.
[1] is a fruit-bearing tree in the soapberry family Sapindaceae, native or naturalised over a wide area of the tropics, including South and Central America, Mexico, the Caribbean, and parts of Africa and the Pacific.

Read the wiki on it

and it's delicious when ripe off the tree , but doesn't taste as good when picked green and ripened, probably why more people don't know about it.
cheers