I used to snarf down two dogs and a papaya smoothie at Gray's Papaya over in mid-town Manhattan on 72nd street pretty regularly. Papaya King was over on the east side (85th street or so?) so did not make it over there much but similar concept. These places rock when you're late night munchie or just looking for something quick. Welcome to LA!
I've only had Nathan's the one time I went to NY, their main location which was cool.
Papaya King on 86th and 3rd is in my old hood.