Perfectly cooked medium-rare prime rib is the result every time you use Chef John’s mathematical method.

Most Helpful Reviews From Allrecipes.com

This is a fool proof method for making the best medium rare prime rib. Your seasonings can be changed according to your preference, but what’s listed works perfectly. It’s the cooking method that is the key. It cannot be stressed enough, the roast MUST be at room temperature in order for this to work. If it is the least bit cold in the middle of the roast, you will come out with a very rare roast. A mistake I only made once because I was worried about leaving it out to get warm. Don’t worry! It will be fine! I usually purchase 4.5 to 5 lb roasts and take it out of the fridge for a minimum of 5 hours to be sure it is room temp. It comes out absolutely PERFECT and juicy every time.

I have used this recipe for years and it works perfectly- ONE THING that will cause the meat to be less than medium rare, besides not having the rib at room temperature, is the fan in newer ovens!! I had no issue for many years until I got a new oven in 2012. Many new ovens have a fan that comes on when you turn the oven off. It quickly lowers the temp, which, obviously, will not work for this recipe. Since I have a built-in oven, I actually shut off the breaker to the oven so the fan doesn’t come on. Otherwise you can just unplug it. I guarantee that was the problem with folks who had theirs come out rare!

This works well for certain ovens. Here is the fool proof plan! After your calculated 500 degree blast turn off the oven. In 30 minutes check the oven temp by setting it to bake at 325 degrees. If your oven is below 325 and begins to heat up your oven either has a vent fan or cools off too quickly. No problem. Set it to 275 and leave it for the next hour. You are now at 1.5 hours after the blast. Turn oven off for the last half hour. Perfection. If your oven is over 325 one half hour after the first half hour blast you should be good with original recipe.

Ingredients

prime rib roast with or without bone (any size)

Garlic powder

Salt

Pepper

Directions

  • Preheat oven to 550F degrees.
  • Make a rub of salt, pepper and garlic powder and apply to meat. Place meat in a shallow roasting pan fat side up.
  • Roast at 550 at 5 minutes per pound for RARE, or 6 minutes per pound for MEDIUM and 7 minutes per pound for WELL DONE.
  • Turn off oven at the end of cooking time and DO NOT OPEN OVEN DOOR FOR TWO HOURS.
  • At the end of the 2 hours, remove meat from oven to slice; it comes out perfect everytime.
  • Works the same with Roast beef. Try it you won’t be disappointed.

Source: Allrecipes.com

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