I found a recently fallen fruit at the bottom of the pot on mine, and ate it. Mine was very soft and springy like a tiny water balloon or a soft wad of bubble gum, and sort of burst when I bit into it. Mine only had one tiny seed, not three huge ones like in the picture above. The taste was meh, though. Somewhat sour, not sweet. Not unpleasant, but not something that seems worth growing. Maybe if mine continues to produce fruits with high flesh to seed ration and good texture it might be worth cross-breeding? I'll report back as I get to try more fruits from it.
EDIT - this fruit was some other eugenia that had fallen into the pot, maybe a uvaia