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Slow-Roasted Prime Rib Recipe

Servings: six to eight.

A luxurious centerpiece for a holiday menu, this three-bone prime-rib roast gets heaped with a big pile of smashed garlic, butter, and fresh herbs, then slow-cooked it in a low oven for at least two hours, until the meat becomes meltingly tender, and the herbs and garlic infuse it through and through.


Need more ideas for an elegant Christmas dinner roast? Read our Guide to Buying and Carving Prime Rib (before you hit the meat market) and check out our Guide to Christmas Dinner where you’ll find a juicy prime rib dinner menu and a recipe for a dry-aged beef rib roast sure to impress your guests.


  • 3-bone beef rib roast (about 6 lb.), preferably from the small or loin end and Prime grade
  • 3 Tbs. fleur de sel or other flaky sea salt
  • 1-1/2 Tbs. coarsely cracked black pepper
  • 1 Tbs. extra-virgin olive oil
  • 8 to 10 sprigs rosemary
  • 8 to 10 sprigs thyme
  • 10 medium cloves garlic, smashed and peeled
  • 3 Tbs. unsalted butter, cut into 1/2-inch cubes

Nutritional Information

  • Nutritional Sample Size based on eight servings
  • Calories (kcal) : 750
  • Fat Calories (kcal): 555
  • Fat (g): 62
  • Saturated Fat (g): 26
  • Polyunsaturated Fat (g): 2.5
  • Monounsaturated Fat (g): 26
  • Cholesterol (mg): 175
  • Sodium (mg): 1400
  • Carbohydrates (g): 2
  • Fiber (g): 0
  • Protein (g): 45


  • Take the beef out of the refrigerator 2 hours before cooking so it can come to room temperature. After 30 minutes, season the meat on all sides with the fleur de sel and cracked black pepper.
  • Position a rack in the center of the oven and heat oven to 325ºF.
  • Turn on the exhaust fan. Heat a 12-inch skillet over high heat for 1 minute. Swirl in the olive oil and,  when the oil puts off its first wisp of smoke, place the beef in the pan, and sear it on all the outer sides (not the cut sides) until well browned, 6 to 8 minutes total. Use a set of tongs to flip the beef; be careful of splattering oil. With two sets of tongs, transfer the beef, bone side down, to a roasting rack set in a small roasting pan. Arrange the rosemary, thyme, garlic, and butter evenly on top.
  • Roast the beef, basting every 30 minutes with a bulb baster, until a thermometer inserted into the center reads 120º to 125ºF for rare, about 2 hours. Cook to 130º to 135ºF for medium-rare (about 2-1/4 hours), 140º to 145ºF for medium (about 2-1/2 hours). Let the meat rest at least 15 minutes before carving.

For a delicious sandwich using the leftovers see Prime Rib Sandwich with Roasted-Garlic Dijonnaise.


Fleur de sel is a premium sea salt harvested in France. You can find it in specialty stores or online at Saltworks.


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Reviews (24 reviews)

  • liltoolgirl | 01/23/2021

    Over the last couple of years, I have ruined at least 6 primeribs roasts (cry). Then I came across this recipe. I made this today and WOW it was amazing. Melt in the mouth, delicious!! My husband actually asked me to bookmark this page! One thing I must note that there was a miniscule amount of juice so I could not base it. Nevertheless it came out so beautifully. Thank you thank you. !! Jules

  • Brookelyn | 12/31/2018

    Do you leave uncovered or not?

  • jemstones | 12/26/2013

    This was awesome. My first shot at Prime rib and it was delicious. My husband just raved about it. He likes my cooking, but was over the moon with this. I made it just as written. Perfection! Thank you again FC.

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