If you’re looking for an authentic Chicago-style Italian beef sandwich, this probably isn’t it (you might want to check out this article for some tips). But if you’re looking for a very tasty Chicago-inspired Italian beef sandwich, this is definitely it.
The combination of beef, swiss cheese, onions, au jus, and giardiniera is savory, delicious, and flavorful. We smoked an eye of round roast on the grill, but you could also buy thinly sliced roast beef from the deli as an easy option. I also highly recommend purchasing a Chicago-style giardiniera (such as Marconi), instead of the Italian style (which won’t have the right flavor). Another tasty option is to cook sliced bell peppers and mushrooms along with the onions to make a sort of Philly-style sandwich.