Amazing Slow-Roasted Prime Rib

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I had never made prime rib before, but this amazing slow-roasted prime rib recipe is so easy. It originated from my mother-in-law, who makes prime rib often. After a lot of research, I made a few changes and prefer my recipe with the alterations.

Submitted by Melanie Tuning
Updated on January 28, 2025
Prep Time:
5 mins
Cook Time:
2 hrs 45 mins
Additional Time:
1 hr 30 mins
Total Time:
4 hrs 20 mins
Servings:
24
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Ingredients

Original recipe (1X) yields 24 servings

  • ½ cup soy-based liquid seasoning (such as Maggi)

  • ½ cup Worcestershire sauce

  • 3 cloves garlic, minced, or more to taste

  • 9 pound bone-in prime rib, cut and retied to the bone

Directions

  1. Combine liquid seasoning, Worcestershire sauce, and garlic in a bowl; pour over prime rib in a large glass or ceramic bowl. Marinate in the refrigerator for 1 to 2 hours, flipping every 30 minutes.

  2. Preheat the oven to 450 degrees F (230 degrees C).

  3. Place prime rib on a baking rack set inside a large baking dish.

  4. Cook in the preheated oven until all juices are sealed in, about 45 minutes.

  5. Reduce oven temperature to 325 degrees F (165 degrees C). Continue cooking until an instant-read thermometer inserted into center reads 130 to 140 degrees F (54 to 60 degrees C), about 2 hours more.

  6. Rest prime rib sit before slicing, 30 minutes to 1 hour.

Recipe Tips:

Cook 30 minutes per pound for medium or an internal temperature of 130 to 140 degrees F (54 to 50 degrees C).

Make sure to add water to the bottom of the baking dish so the drippings don't burn while cooking.

Feel free to use the drippings to make a sauce or gravy.

Editor's Note:

Nutrition data for this recipe includes the full amount of marinade ingredients. The actual amount of marinade consumed will vary.

Nutrition Facts (per serving)

225 Calories
15g Fat
1g Carbs
21g Protein
Nutrition Facts
Servings Per Recipe 24
Calories 225
% Daily Value *
Total Fat 15g 19%
Saturated Fat 6g 31%
Cholesterol 60mg 20%
Sodium 144mg 6%
Total Carbohydrate 1g 0%
Total Sugars 1g
Protein 21g 42%
Vitamin C 1mg 1%
Calcium 14mg 1%
Iron 2mg 12%
Potassium 331mg 7%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.