For a French dip sandwich you need a bread roll, such as a French roll, crusty French Bread, hoagie roll or any toasted bun. You could even use crescent rolls. Slice them in half and then layer tender beef slices from a beef roast, leftover roast beef or leftover prime rib onto the roll. Afterwards top with sliced cheese, such as Swiss cheese or provolone cheese, for example. Close the sandwiches, toast them in the oven and then dip them in au jus dipping sauce. For detailed instructions and tips take a look at our French Dip Sandwich Recipe.