Luanne and Joe Margotte, proprietors of the Chicago sandwich shop on West Colfax, are displaced Chicagoans in thought, word and deed. As such, they serve up the authentic comfort food of their hometown --Vienna beef hot dogs piled with yellow mustard, relish, chopped onions, tomatoes, pickles and sport peppers; overstuffed Italian beef and sausage sandwiches dripping with juice; pork chops Maxwell Street-style, topped with brown mustard, grilled onions and more sport peppers; even Salerno butter cookies. They also pipe in WGN radio broadcasts of Cubs and White Sox games via the Internet. The place is like a miniature Second City, right down to a pride of place bordering on comic hostility.