Amazing Slow-Roasted Prime Rib


I had never made prime rib before, but this prime rib slow cooker 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.

Prep Time:
5 mins
Cook Time:
2 hrs 45 mins
Additional Time:
1 hrs 30 mins
Total Time:
4 hrs 20 mins


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

  • ½ cup Worcestershire sauce

  • 3 cloves garlic, minced, or more to taste

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


  1. Mix liquid seasoning and Worcestershire sauce together with garlic in a bowl. Pour over prime rib in a container. Marinate for 1 to 2 hours, turning 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. Bake in the preheated oven until all juices are sealed in, about 45 minutes.

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

  6. Let prime rib sit for 30 minutes to 1 hour before slicing.

Cook's Notes:

30 minutes per pound = medium internal temperature should be 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 do not 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
Vitamin C 1mg 5%
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.

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