Hi all,

I've got this weird fruit that I found in the Menlo Park, CA, area. I
found it on some tree growing and ate some of them, people told me
they were harmless (but don't know what the name is). They're fairly
small, have a semi-hard spiky outside that one can bite through to get
to the soft, sweet, yellow inner flesh. Any ideas? I've attached some
pictures. Sorry the one with the bowl is discolored.

Pics: http://img197.imageshack.us/gal.php?g=pic0028z.jpg

Thanks!