A friend from Chicago recommended the Italian beef at Buona, but to me it didn’t have much flavor.
So based on The Juicy History of Chicago’s Mr. Beef Started With Carl Bonovolanto - Eater Chicago we went to Mr. Beef and it was great. I recommend double-dipped with hot giardiniera (which is not actually very spicy). If I didn’t know it was the model for The Bear I wouldn’t have guessed. Maybe I need to watch some of the first season again.