Because of L.A.'s climate some of the street fruit here is more unusual than what you can buy in stores. Like the loquat. Loquats grow well in California, but they are still relatively uncommon. They don't keep well, and they're a bit difficult to eat, so you won't find them in stores, at least not in the U.S. I have seen them at farmers markets and at fruit stands in Europe.
Loquats have a nice refreshing taste. They tend to be juicy and wet, although the thin flesh relative to the large pit means that you never seem to get a satisfying mouthful. The flavor is like a very mild apricot crossed with a longan.
Here's a tree on 3rd St. in L.A. with plenty of fruit hanging over the sidewalk.