Italian Beef is a richly flavored, slow-cooked dish made with tender beef chuck roast simmered in French onion soup and seasoned with zesty Italian dressing mix. This Midwestern-style comfort food gained popularity through potluck dinners and casual gatherings where shredded, savory beef sandwiches shine. The acidic tang of vinegar in the dressing gives this roast a memorable bite, making it a family favorite for both weekday meals and special occasions.