I'm from Chicago and have spent years trying to find a place here on the Westside that has good Italian roast beef and to be perfectly honest with you Windy City dogs hands down has the best Italian roast beef in all of Arizona.
They use Vienna Beef and the hot Giardiniera is made by Vienna as well. The seasonings that they use in their au jus is a trade secret, I've been to Portillos I've been to lukes of Chicago I've even tried Freddy's steakburgers Italian roast beef but no one compares to Windy City dogs.
I tell all my friends from Chicago that if you want some good roast beef sandwiches Windy City dogs is the place to go.