What is in the dip of a french dip sandwich?
French dip sandwiches are served with "au jus" (meaning "with juice" in French). The dip is typically the beef juice collected during the cooking process to create the sandwich. Different ingredients can be added to this dip broth to make it even more tasty. Substituting the broth entirely for a different dip is also done, but is frowned upon by connoisseurs.
