This Slow Roasted Prime Rib Recipe will make you look like you spent hours preparing in the kitchen. But we both know that isn't so. How to cook prime rib in a roaster is easier than you think and you might just impress some people along the way.
Prep Time10 minutesmins
Cook Time1 hourhr40 minutesmins
Resting Time30 minutesmins
Total Time2 hourshrs20 minutesmins
Course: Main Entrées
Keyword: easy dinner, family meals, prime rib roast
1tbspcorn starchyou can substitute potato starch for Whole30/Paleo
Calculate the cooking time using the chart in the notes section.
Preheat oven to 500°℉.
Cut the bones if you prefer. Season with salt, pepper, olive oil and any herbs.
Place the roast on top of the bones in the roasting pan and place in oven to cook for 15 minutes at 500°℉. (uncovered)
After 15 minutes reduce oven to 325 degrees. Using a thermometer check the roast in half way through cooking time and then every half hour thereafter.
Once it has reached the internal temperature you desire, remove from oven and let rest for 30 minutes.
While the roast is resting, warm up one cup of water in a small saucepan, add a beef bouillon cube and some pan drippings. Bring to just about boiling. In a small cup add the starch and a little bit of water just to create a runny paste. Add starch mixture and bring to boil until mixture thickens to your liking.
Serve gravy with roast.
15 mins per 1 lb
17 mins per 1 lb
19 mins per 1 lb
15 mins per .454 Kg
17 mins per .454 Kg
19 mins per .454 Kg
Prime Rib Roast Cooking Time CalculationExample: 5 lb prime rib roast Initial cooking: 15 mins at 500°F/260°CContinue cooking for: 5 lbs x 17 (for medium) = 85 mins or 1 hour and 25 minutes.Resting: 30 minutes (tented)Total time: 130 minutes or 2 hours and 10 minutes