Garcinia of some sort. Maybe improved lemon drop or achachairu. Definitely not eugenia.
What’s the ‘obvious differentiator’ for future reference?
Only Garcinia I have experience with has multiple seeds
I can see how maybe based upon the fruit alone, considering ubajay and other eugenias. But the leaves are large and thick, much larger and thicker than most eugenias. The opposite leaves definitely suggests garcinia to me. Based upon this, started thinking of garcinias with fruit that look like that.