Ingredients

Estimate 1 (one) lb. of bone-in roast, and 12oz. boneless roast per adult serving
Dry rub seasoning:
Salt
Garlic Salt
Onion
Black Pepper
Oregano
Paprika
Rosemary
Celery
Directions

Pre-heat oven to 250 degrees. Season roast generously with dry rub mix. Place roast uncovered on roasting pan, bones down on a bone-in roast. Cook 40 min per pound 250 degrees. Remember, Prime-rib is served in thick, steak like portions.
For a perfectly cooked roast you will always want to use a meat thermometer. This will give you an exact internal temperature.
Rare = 140 degrees
Med = 145 degrees
Well = 155 degrees
From: Chef Shane Marberger, Marberger's Meat and Deli