This plant/tree has been growing under my trampoline for a few months. At first all the fruit was green and there were no flowers. Now the fruit is turning yellow and there are tiny white flowers with yellow centers.

Some people have already suggested guava, kiwi, and coffee. I don't think it's any of those, though. Another person thought it may be in the moraceae family, but I don't think that's the case either. It seems too peppery and tropical.

It's most definitely not a Brazilian pepper tree. I've had many of those, and this is extremely different.

Here is a link to some pictures:

http://www.flickr.com/photos/76994717@N00/577123991/in/set-72157600262728431/