This morning when I walked around the countryside, I and my wife stopped by my colleague's house. We there enjoy jamblang fruit or rivet guava.
This fruit grows a lot in the tropics like in Indonesia which is detrimental to the tribe of the guava. The taste that is sepat and sour is very appetizing. This jamblang fruit is very similar to black grapes. The fruit will change color from green while still young then turn purplish black or black when it's ripe.
Fruit with the Latin name Sygyzium Cumini has high nutrition because it contains a lot of protein, minerals and vitamins.