Am going on a day long jaunt to find the most interesting and tasty snacks, desserts, drinks, etc. next Monday. I am going with a sophisticated restaurant owner who has seen most all of it. Would like recs on interesting places to go. Examples might be; the sticky bun at BOUCHON or the Dosa-Cart guy on Sullivan. Also, where is the green sandwich place in Chinatown? We are taking a car service so far corners of Manhattan are OK.