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How Many People Does a 4lb Prime Rib Feed

A slow roastedPrime Rib recipe with step by step instructions and tips for how to slow roast a boneless or bone-in prime rib roast. This herb and garlic crusted prime rib is unbelievably easy to make and is sure to "WOW" your dinner guests!

A 5 pound prime rib roast served on a white platter with fresh herbs underneath, with a few slices carved and laying on the platter.

Cooking prime rib can seem intimidating, especially since it is so expensive and you don't want to ruin it, but it is actually really simple!  This easy prime rib recipe has simple ingredients and easy to follow instructions that will allow even the most novice cook to have success!  Let's start with the basics:

About the Price:

This section of beef is so tender and delicious that is comes at a cost.  Most local grocery stores carry choice grade prime rib for between $10.99 to $11.99 per pound. I've found Costco to have the lowest prices for the best quality.  They even sometimes carry prime grade meat.

Prime Rib is expensive, but just like most things, it's much cheaper to serve at a dinner party at your house then to buy for everyone at a restaurant!

How much do you need?

Prime rib roast is also referred to as standing rib roast and it is the cut of meat that is taken from the back of the upper ribs of the cow.  This prime rib section typically makes up about 7 ribs.  You don't have to buy the whole section, just specify to your butcher how many pounds you would like.

The rule of thumb for buying prime rib is to buy one pound per person.  A bone-in standing rib roast will feed about 2 people per bone. Also, be sure to consider how many side dishes you plan to serve.  If you are preparing a large holiday meal with plenty of other food you could plan on ½ – ¾ pound prime rib per person.

A standing rib roast tied with kitchen string, resting on a marble board.

Bone-in or boneless Prime Rib:

You can choose to buy your prime rib bone-in or boneless.  Many chef's would say that bone-in ribs are more flavorful and cook better. I typically buy bone-in but I've cooked a boneless prime rib from Costco and honestly couldn't really tell a difference

If you buy a bone-in prime rib you should ask the butcher to cut the bone off and tie it to the roast for you.  My local butcher does this without asking, but ask them just in case. This way you can cook the bones with the meat: they make a nice rack for the meat to sit on, but then you can easily remove them before carving the roast.

If you decide to buy a boneless prime rib you will want to set it on a rack to roast. I've had success using the wire rack from my instant pot set on top of my cast iron skillet.

Cook time and Temperature:

The length of time you decide to cook your prime rib depends on how rare you want your meat.

Start by cooking your prime rib at 500°F for 15 minutes and then lower the oven temperature to 325° F and cook for 10-12 min per pound for rare prime rib, or 13-14 min per pound for medium rare prime rib, or 14-15 min per pound for medium well prime rib.

A meat thermometer is essential to ensure you cook it perfectly!

A fully cooked standing rib roast (prime rib) in a cast iron skillet.

Roast your prime rib until the thermometer registers:

  • 115-120˚F for rare
  • 125-130˚F for medium rare
  • 135-140° F for medium
  • 145-150 F° for medium well

Please keep in mind that the meat temperature will continue to rise 5-10 degrees when it's resting out of the oven, so don't over cook it!

How to make Prime Rib:

1. Let it rest.  Remove your prime rib from the refrigerator about 1 hour before cooking to give it time to come to room temperature. Season it with a little bit of salt and cover it lightly with plastic wrap while is rests.

2. Prepare herb rub.  Combine the salt, pepper, fresh thyme, rosemary, garlic and olive oil and rub it all over the outside of the roast. Place a bone-in roast with the bones down, in a cast iron, roasting, or other oven safe pan. Place a boneless rib roast on top of a rack, and then in your pan.

A small glass bowl with ingredients for seasoning prime rib next to another photo of a bone-in prime rib roast inside a cast iron skillet with the seasoning on top.

3. Cook the boneless or bone-in prime rib at 500 degrees for 15 minutes and then reduce the oven temperature to 325 degrees and continue cooking until the meat is 5-10 degrees away from the desired doneness temperature (see cooking temperature guidelines above or below in the recipe card).

4. Allow time to rest.  Remove the prime rib from the oven and and tent the entire roast with foil. Allow it to rest for 30 minutes–It will continue to cook the extra 5-10 degrees. Resting the meat is essential as it allows the juices to seal back into the meat. If you cut the meat too soon, the juices will run out and you will be left with a chewy prime rib roast.

5. Carve and Serve.  Spoon some of the extra sauce from the pan over the roast, if desired, or use it to make gravy. Cut the kitchen string holding the roast to the bones (if using a bone-in roast) and remove the bones before carving.

A seasoned and cooked prime rib in a cast iron pan with a spoon pouring the dippings over it, next to another photo of the prime rib removed from the pan, leaving the bones behind in the skillet.

Tips for perfect prime rib:

  • Use a meat thermometer! You can use a probe that stays inside the meat the entire time it cooks or you can use a simple instant read meat thermometer.  Either way, remember that each slice of meat is different and each oven is different.  Don't take the chance of ruining such an expensive piece of meat.
  • Don't over-cook!  The meat will continue to cook once it's taken out of the oven (your thermometer will continue to rise 5-10 degrees) so err on the side of taking your prime rib out early. If you take it out and it seems under-cooked, you can always cook it a little longer.

Prime rib roast carved into ½ inch thick slices.

  • Let it REST! As with most meat, you want to let it rest after cooking to allow the juices to settle in the meat, making it juicier and more tender. If you cut into your prime rib without letting it rest, the juices will rush out and the meat will be chewy.
  • Cut meat across the grain.  That means, notice the directional lines in the meat grain and slice perpendicular to them. If you cut along the grain then the meat will be tougher and chewier to eat.

A slice of prime rib served on a white plate with horseradish sauce, mashed potatoes and roasted Brussels sprouts.

Perfect Sides for Prime Rib:

  • Perfect Mashed Potatoes or Twice Baked Potatoes
  • Roasted Vegetables
  • Homemade Rolls
  • Classic Wedge Salad
  • Skillet cornbread

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Recipe

Prep 10 mins

Cook 1 hr 45 mins

Resting Time 1 hr

Total 1 hr 55 mins

Save Recipe

  • 5 pounds beef prime rib (or larger* if larger, double the spices/seasonings)
  • Sea salt
  • 2 teaspoons freshly ground black pepper
  • 2 teaspoons fresh rosemary
  • 1 teaspoon fresh thyme
  • 8 cloves garlic , minced
  • 1/4 cup olive oil
  • horseradish , for serving (optional)
  • Remove your prime rib from the refrigerator one hour before cooking. Season it on all sides with salt and cover it loosely with plastic wrap as it comes to room temperature. Prime rib roast will cook better and more evenly when it's at room temperature.

  • When you are ready to cook the prime rib, lower/adjust your oven rack so the meat will cook in the center of the oven. Preheat the oven to 500 degrees F.

  • In the meantime, mix together 1 ½ teaspoons salt, pepper, rosemary, thyme, garlic, and olive oil.

  • Pat the roast with paper towels. Spoon seasoning over it, rubbing it onto all sides.  Place bone-in roast with the bones down, inside a roasting pan cast iron pan. Place a boneless roast on a rack inside the pan.

  • Bake prime rib at 500 degrees for 15 minutes, then reduce the oven temperature to 325 degrees and continue baking until desired doneness:

    Rare: cook until thermometer reaches 120 degrees F (about 10-12 min/pound)

    Medium rare: Cook until thermometer reaches 130 degrees F (about 13-14 min/pound)

    Medium: Cook until thermometer reaches 140 degrees F (about 14-15 min/pound)

    Medium well – Cook until thermometer reaches 150 degrees F

  • A couple of things to keep in mind:

    - A meat thermometer is essential to ensure it cooks to your perfect doneness. Not all roasts or ovens are the same!

    - Also, the meat will continue to cook once it's taken out of the oven (your thermometer will continue to rise 5-10 degrees) so remove it from the oven 5-10 degrees before it reaches your optimal temperature.

  • - Remove it from the oven and tent it with foil. Allow it to rest for 30 minutes before carving.

  • Carve your roast by slicing against the grain at about ½ inch thickness. Serve with horseradish, if desired.

Calories: 761 kcal Carbohydrates: 1 g Protein: 31 g Fat: 69 g Saturated Fat: 26 g Cholesterol: 137 mg Sodium: 101 mg Potassium: 523 mg Vitamin A: 10 IU Vitamin C: 1.4 mg Calcium: 26 mg Iron: 3.4 mg

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Easy, No-Fuss Prime Rib

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Lauren Allen

Welcome! I'm Lauren, a mom of four and lover of good food. Here you'll find easy recipes and weeknight meal ideas made with real ingredients, with step-by-step photos and videos.

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