I'm not claiming this is an authentic Philly Cheese Steak, I chose this to simulate my favorite cheese steak sub at Sapore di Mare. Elsewhere (and not elsewhere on Recipezaar.com) people have been puzzled why the oven would need to be preheated to 200F; why, it is only to warm up the sandwich rolls! Purists will use only Cheese Whiz, but I will always use Provolone. I love an accent of "hots" on my sub, preferably Sun of Italy "Hot Chopped Peppers"; sliced pepperoncini or banana peppers also work well. I favor sweet onions, so I added them as an option to Emeril's recipe. Also, a half and half mixture of olive oil and butter is heavenly; but if using a nonstick pan, no fat is really needed. To slice the rib-eye, pound it thin, roll it tightly and wrap in wax paper, freeze 10 minutes, then slice thinly. Personally, I would never dream of using ketchup on this sandwich, although I might try a bit of marinara sauce to make this an Italian cheese steak sandwich. Although most people would threaten me if I gave them half a sandwich, I believe that is the correct size for 1 nutritional serving.