5 lb standing rib roast/prime rib, bone in
1 onion, quartered
1 head of garlic, unpeeled, halved horizontally
5 sprigs thyme
3 sprigs rosemary
Garlic Herb Butter:
10 tbsp unsalted butter, softened
5 garlic cloves, minced
2 tsp finely chopped fresh rosemary (or 1 tsp dried)
2 tsp finely chopped fresh thyme (or 1 tsp dried)
2 tsp salt
1 tsp black pepper
- Bring beef to room temperature: take beef out of the refrigerator 2-3 hours before cooking to bring to room temperature. Pat dry with paper towel.
- Preheat over to 450 degrees F.
- Prepare garlic herb butter.
- Place onion, garlic, and herbs in a heavy based oven proof skillet or roasting pan.
- Spread a thin layer of butter on the underside of the beef (i.e., the bone side). Place beef (butter side down) on onion etc. in roasting pan. Spread about 2/3 of the butter on the top and sides, reserving some for step 7.
- Roast 20 minutes in middle of oven.
- Remove and spread remaining butter over the beef. Turn oven down to 250 degrees F.
- Roast for a further 1.5 hrs, basting every 30 minutes with the juices in the pan, until the internal temperature is 118 degrees F (for medium rare). Start checking the internal temperature early to avoid over cooking.
- Transfer beef to plate. Cover loosely with foil and rest for 20-30 minutes. Internal temperature will rise to 125 degrees F.
- Slice beef and serve with au jus.
Note 1: If beef is boneless, start checking the temperature at least 30 minutes sooner.
Note 2: Once the internal temperature reaches 104 degrees F, the internal temperature increases by 10 degrees every 10 to 15 minutes.
Note 3: Unpeeled onion and garlic hold together better so they keep the beef elevated off the base of the pan.
Note 4: For rare beef, pull out of oven at 115 degrees for a target temperature of 120 degrees after resting. For medium rare, pull at 118 for final temperature of 125. For medium, pull at 123 degrees for 130 final reading. For medium well, pull at 127 for 135 final temperature. Do not over cook prime rib!
from:www.recipetineats.com