Fruit Intrigue

I am endlessly fascinated by the varieties of fruit in the world.  Some, I'm not so fond of--bananas, I'm looking at you--and others, well, I wouldn't mind giving a try if I could lay my hands on them.  While I'm not sure exactly what I would do with them, I half-wish I could find a medlar tree that would grow in my Zone 3 yard.  Just to have something as cool as a medlar in my orchard would be fairly nifty...well, maybe I'll just keep seeking a dwarf pawpaw tree that will survive our cold, cold winters and call it good.