How much do you need?
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.
The Prime rib roast (aka standing rib roast) is taken from the back of the upper ribs of the cow and 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.
Bone-in or Boneless Prime Rib:
Bone-in prime rib roasts are typically more flavorful and cook better than boneless prime rib, but boneless will also work great! If you buy a bone-in prime rib, ask the butcher to cut the bone off and tie it to the roast for you. 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 using 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 to cook prime rib depends on how rare you want the 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, or 13-14 min per pound for medium rare, or 14-15 min per pound for medium well.
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