A French dip sandwich, also known as a beef dip, is a hot sandwich consisting of thinly sliced roast beef (or, sometimes, other meats) on a "French roll" or baguette. It is usually served plain but a variation is to top with Swiss cheese, onions, and a dipping container of beef broth produced from the cooking process (termed au jus, "with juice"). Beef stock, a light beef gravy, or beef consommé is sometimes substituted. The sandwich is an American invention, with the name seeming to refer to the style of bread, rather than any French origin. * A French dip *