I strongly doubt yours are really Flacourtia Jangomas.
Don't trust any vernacular names (coffee plum, indian plum, governor's plum...) because they can be deceiving.
Mine is locally called SARALI and just after a long research i found out to be actually Flacourtia Jangomas.
I post some pictures .
This is the actual tree, 5 years old from seed (more like a big shrub about 3m tall)
The long, sharp and scary thorns along the base of trunk and main brunches. Thanks god the upper branches and canopy are thornless
Here a detail of leaves and young fruits. At the moment unfortunately no flowers
Here the fruits, most of them are in nice clusters
Here is a ripe fruit. It's a tiny fruit, about 9-10 grams. Skin turns deep purple, it's thin and edible.
Flesh is deep yellow firm ad a bit juicy if fully ripe.
Taste is very pleasant, strong, sweet with a hint of sour and tangy. If eaten unripe it can be very astringent
Seeds are flat and don't bother
Very easy to grow, mine is actually on a thin limestone layer among rocks.
All in all i love it :-)