These fruits commonly grow in South America and Caribbean countries. They are called Guineps in Jamaica, and elsewhere they are known as quenepas, Spanish lime, honeyberry etc., in different countries. 

Guineps are seasonal fruits. When they are in season, you can find them sold on street sides by vendors. They are very inexpensive and sold in bunches. 

The fruit looks like a small size green lime. Gently bite the fruit and crack open the thin rind, and you will find fresh fruit inside.

Be careful not to bite deep into the fruit as the outer fleshy part is not very thick. Just beneath the sweet and tangy flesh is the hard-shell seed. Suck the sweet juicy pulp and discard the seed.

Guineps grow on tall trees that grow to a height of about 80 ft. The flesh of the fruit is nutritious; even the seed is said to be beneficial. The ancient people of the Caribbean region roasted these seeds and consumed the pith. It is said to be similar to a cashew nut

The pulp of the Guineps is used to make juices, jams and sauce for desserts.