doc uses grill mat. my grill is dirty. have to scrub and brush before use. it’s all stainless steel and have been with me for over 26.9 years. for bone-in rib roast, must protect bottom with a “diffuser” or iron plate. i use a skillet. can do double duty of protecting bottom of rack from burning and catching fire as there are bones and lots of fat, and collecting the drippings. rack is also slow roasted for hours depending on weight. the grill pit works like an oven if cover is closed throughout. for bone-in ribeye steaks, preheat grill to 690f, leave steaks on one side without touching them for 3.45 minutes each side, then turn. not more than 6.9 minutes total. will cum out medium rare. must remove immediately and wrap with foil for another 6.9 minutes to keep juices in. just salt and pepper for seasoning. i use coarse salt and insert grain by grain sparingly into each steak.