If Arby's isn't the first restaurant you think of when you hear the word "prime rib," the folks at the 3,400-unit chain want to change your mind with two new cheesesteak sandwiches that use this top-grade cut of beef. Prime rib is as good as it gets, often reserved for holiday dinners and special occasions, so to use it in a humble cheesesteak sandwich is a little surprising. Usually, cheesesteaks are made with thinly-sliced ribeye or skirt steak, fried with onions and sometimes peppers, tossed with some American cheese, provolone, or, in the case of the classic original Geno's in...
