How to Slow Cook a Prime Rib Roast


Slow cooking a prime rib roast is a simple way to cook an impressive piece of meat. Slow cooking also brings out the roast's natural juices and flavor. The best way to cook a prime rib roast is in an oven rather than a slow cooker. Oven baking requires completing a few preparatory steps and being available to lower the oven temperature partway through the process.

How to Slow Cook a Prime Rib Roast
(Andrew Turk/Demand Media)

Things You'll Need

  • 3 to 4 rib prime roast
  • Cutting board
  • Serrated knife
  • Large cooking pan
  • Salt and pepper
  • Cooking thermometer
Step 1

Preheat your oven to 450 degrees.

Andrew Turk/Demand Media
Step 2

Set your prime rib roast on a cutting board with the fat side up. Trim the fat away from the prime rib roast with a serrated knife until it is about 1/4 inch thick.

Andrew Turk/Demand Media
Step 3

Place your roast in a large baking pan, fat side up.

Andrew Turk/Demand Media
Step 4

Rub the fleshy part of your prime rib roast generously with salt and pepper.

Andrew Turk/Demand Media
Step 5

Put your prime rib in your 450-degree oven for 15 minutes to sear the outside and seal in the juices.

Andrew Turk/Demand Media
Step 6

Turn the oven temperature down to 325 degrees, and bake your prime rib roast about 11 minutes per pound.

Andrew Turk/Demand Media
Step 7

Remove your prime rib roast from the oven, and check its internal temperature with a cooking thermometer. Rare is approximately 120 degrees. Medium well is about 140 degrees.

Andrew Turk/Demand Media
Step 8

Cover your prime rib roast with aluminum foil after baking, and let it sit for 15 to 20 minutes. This will let the juices redistribute and keep your roast from being too dry.

Andrew Turk/Demand Media

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Tips & Warnings

  • Dry marinades can also be used to flavor your prime rib.
  • Save the pan drippings to make an au jus sauce.
  • One rib serves one to two people.


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