The Italian Beef sanwhich is something , thin slices of roast beef, soaked in juices, topped with Scala giardinera, or sweet peepers. Mmmm. Don't get fooled into going to Mr. Beef on Orleans or Portillo's . The best beef stands are on the Northwest Side. Johnny's, Michael's, Roma's, Jay's, and my number one choice for juicy beef's and fries, Mr. Beef on Harlem. True Chicago.