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Classic Roast Prime Rib of Beef au Jus

User Rating 4.5 Star Rating (5 Reviews)


Roasted prime rib
Jun Seita/Flickr
Perfect prime rib is an easy undertaking if you follow a few key steps. The most important is using an accurate digital thermometer. This is the only way to ensure the desired doneness, which hopefully is a perfectly pink medium-rare, when the flavor and texture are at their best.

This prime rib recipe will work no matter what size roast you're using. A great rule of thumb is each rib will feed 2 guests. So, a 4 rib roast will serve 8 guests.

Prep Time: 10 minutes

Cook Time: 3 hours

Total Time: 3 hours, 10 minutes


  • 1 standing beef rib roast (4 to 7 ribs, 9 to 18 pounds)
  • fresh course-ground black pepper, as needed
  • kosher salt (or other larger grain, flake-style salt), 1/2 teaspoon per bone
  • softened butter, 1/2 tbsp per rib of beef
  • large metal roasting pan with at least 3-inch sides.
  • 2 tbsp flour
  • 1 quart cold beef broth


  1. Remove the prime rib from the refrigerator and place in the pan. No rack is needed as the rib bones form a natural rack, and will keep the prime rib off the pan. Rub the entire surface of the cold roast with butter, and coat evenly with the kosher salt and black pepper.

  2. Leave the prime rib out at room temperature for 2 hours. Preheat the oven to 450 degrees F. When the oven is hot, put the roast in and cook for 20 minutes to sear the outside of the roast. After 20 minutes turn the oven down to 325 degrees F. and roast until the desired internal temperature is reached (see guide below). For medium-rare this will take approximately 15 minutes per pound.

  3. Transfer to a large platter, and let the prime rib rest, loosely covered with foil for 30 minutes before serving. Cutting into the meat too early will cause a significant loss of juice.

To Make the "Au Jus" Sauce

While the prime rib is resting, pour off all but 2 tablespoons of the fat from the pan and place on the stovetop over medium heat. Add the flour and cook, stirring, for 5 minutes to form a roux. Pour in the beef broth and whisk into the roux, scraping all the caramelized beef drippings from the bottom of the pan.

Turn heat to high and cook the sauce for 10 minutes until it reduces and thickens slightly (this is not a gravy, so don't expect a thick, heavy sauce). Adjust seasoning, strain and serve along side the prime rib.

Internal Temperature Guide

Below are the internal temperatures to go by, depending on how done you like your prime rib. Remember, these are the temperatures to remove the beef, and not the final temperature. The roast will continue to cook after it's removed.

Rare: remove at 110 degrees F. (final temp about 120)

Medium-Rare: remove at 120 degrees F. (final temp about 130)

Medium: remove at 130 degrees F. (final temp about 140)
User Reviews

Reviews for this section have been closed.

 4 out of 5
Amazing!!!!!, Member kgibbs25

I researched and researched about how to cook a prime rib and kept coming back to this recipe. I have to say that everyone LOVED it and it came out perfect!!!! I cooked one a year ago that was so WELL DONE that I couldn't even eat it. This prime rib was so amazing and cooked PERFECT! Thank you!!!!

96 out of 103 people found this helpful.

See all 5 reviews

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