Favorite sandwich:
Doumar's minced pork BBQ with slaw. And a fizzy limeade. Mmmmmm.
http://www.doumars.com/
Next runners-up --
Grilled Cabot extra sharp cheddar on Vital Vittles' three-seed bread, with jalepeno jelly and cold sliced tomato (i.e. do not grill the tomato). That SoCal grilled cheese sandwich involving truffles is sounding damn good too.
Chicken parm (chicken cutlet) sandwich. How can we not have these in SF?
Hot coppa with fries and slaw at Giordano's.
I love corned beef sandwiches but haven't been to Katz's or Second Ave. deli yet. Next trip!