May I suggest that you visit the Alamo Square Flea Market today, Saturday, August 21st?  The dear Indie Mart people will be in attendance, and surely a cortege of food cartage (putting lie to the idea that this is solely a Mission-based phenomenon).  Whosoever buys me the oddly-shaped plastic dinosaur being sold on the Hayes side of things merits themselves a drink. 

NOTE: I saw some treasure there, get there fast and carry small bills.