Have Prime Rib (I use a boneless ribeye roast) at room temperature. Season entire roast with black pepper and Worcestershire powder all over. Rub it in good all over. If have found Worcestershire powder at Kroger in spice section.

Preheat oven to 500 degrees. Have a large roaster (disposable) pan. Cover bottom of disposable roaster pan with 1/2 inch to 1 inch deep of rock salt (ice cream rock salt). Sprinkle 1/2 cup hot water over salt.

Place roast on top of salt. Cover completely with rock salt. Sprinkle 2 cups water over salt. Bake in oven 12 minutes per pound for rare; 15 minutes per pound for medium; 17 minutes per pound for well done.