I just discovered this site, and had to comment on one of my favorite pigout foods mentioned in some earlier postings: St. Paul sandwiches. We are talking here about egg foo yung on white bread with lettuce, pickle, and mayonnaise. I know, it sounds bizarre, but one of these babies, together with a half-order of pork fried rice, can make me smile. I used to pick up this low budget feast frequently at Park Chop Suey when I lived in Lafayette Square in the mid-'80's. They are still open, although I can't vouch for current quality.
Generally you can find St. Paul sandwiches at the low-end Chinese carryout places found in lower income neighborhoods. I had one recently in University City at a place on Olive Blvd. whose name I cannot currently recall.