This "city" sandwich consists of thin slices of beef, slices of American, & often sauteed onions on a roll
Sandwiches are a common type of lunch food often eaten as 
part of a ... United States (Philadelphia, Pennsylvania), Thinly sliced steak and 
melted... [DOC] [TLE] Steak sandwich - Wikipedia [PAR] A variation popular in New England includes very rare, very thinly sliced roast 
beef, often on an onion roll.