How do I cook a Prime Rib?
Put roast on roasting rack and place in roasting pan. Insert roast into a pre-heated 450°F oven. The cooking time of this phase depends on the size: 30 minutes for 3-4 ribs and 45 minutes for 7 ribs.
Turn the oven down to 250°F and cook the roast for another 30 minutes.
Remove roast from oven, but do not turn off. After a 30 rest, return the roast back to oven.
The roast needs to cook at 250°F until the center of the roast is 15°F below the target temperature: 110°F for rare, 115° for medium-rare, 125°F for medium (carryover cooking will add 15°F to these). The easiest way to determine this is to use a probe to monitor the internal temperature. Alternatively, you can use a quick read thermometer to occasionally measure the temperature. The center will cook ~1°F every two minutes. (I.e., if you have 20 degrees to go, then you need about 40 minutes.) (This step typically takes about 60-90 minutes for rare, 70-100 minutes for medium-rare and 90-120 minutes for medium.)
Remove the roast from the oven, wrap in foil and let it rest for 30 minutes. Remove the roast from foil and let it rest another 15 minutes. Make an au jus from the pan drippings.
Slice the rib as desired and plate. Serve with au jus.
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