If you're going to have leftover prime rib from Christmas, you'll want to save this recipe! Don't let those leftovers go to waste! Thinly sliced medium-rare prime rib, rich provolone cheese, a homemade butter mixture, and my Garlic Butter Rub take this recipe to a whole new level. Easy, cheesy, and delicious! Ingredients: ¾ cup butter 1 ½ tablespoons Grey Poupon mustard 1 ½ tablespoons Bear & Burton's W Sauce Fireshire Prime rib, sliced 1 package King's Hawaiian rolls 12 slices of provolone chee