French Dip, originated in Los Angeles, is prepared using roasted prime rib, rib eyes, rump roast, or other cuts of marbled meat. It's cooked down until pull-apart and juicy. It's served on a sandwich bun with a side of au jus to dip it inu003cbr/u003eu003cbr/u003eItalian beef, originated in Chicago,  is made with chuck roast or another marbled roast seasoned with Italian seasonings and pickled peppers. It can also be flavored with pickled Italian vegetable mixture, also called Giardiniera.