Don't do it! by: Jacki Cammidge, Certified Horticulturist
If you don't know what the fruit is, don't eat it! You run the risk of poisoning yourself. Just because a plant produces fruit, it doesn't follow that it's edible. You don't say where the plant came from, but if you bought it somewhere, take the picture to where it came from and ask there.
Sorry I can't help you with this, these types of trees don't grow in my area. Look for a botanist or horticulturist near you who would be familiar with local plants.