I used to live in SF and I used to go to Sam Wo's. Now I know the place is famous as a greasy joint with surly waiters. but this is the thing, they make a Cold Noodle Roll which I have not seen anywhere else. Its awesome. Its really the best use of $2.25 on this planet. they take a big sheet of rice noodle and put cilantro,bbq pork and tofu(?) and cut it into little sections. dip this in some hot mustard and you have Nirvana. enjoy! I can't really recommend anything else but if your strolling through Chinatown,try it!