Name of a fruit? There is a tree at my school which grows fruit on it,...

There is a tree at my school which grows fruit on it, one of my friends told us they be eatable if you peel the skin sour. We have no theory what this fruit is called so we name it after my friend (her last nickname is Pang, we call them Pangies) =D

They are a small washed out fruit, u peel them and they are sweet, the trees leaves are approaching, big and long? looks a bit tropical. I don't know how else to explain it, I would provide a photo but don't know what to search on google to find one =P
Answers:    Where contained by the world are you?
ok, congratulations on figuring it out.