How much prime rib do I need per person?
A good rule is 1 pound per person for a bone-in roast (bones add weight). If you have big eaters or want generous leftovers, aim for 1 1/4 pounds per person. For boneless, 3/4 to 1 pound per person is usually plenty.
Bone-in or boneless?
Bone-in is classic and a bit more forgiving because the bones act like insulation. Boneless is easier to carve. Both are great. If you go boneless, tie it with butcher’s twine every 1 1/2 inches for even cooking.
Do I really need to let it sit uncovered in the fridge?
You do not have to, but it helps. An overnight, uncovered chill is a simple dry-brine that improves seasoning and helps the exterior dry so it browns better. If you only have a few hours, still salt it and let it sit at room temp before roasting.
What internal temperature should I aim for?
Because this method includes a rest and a hot 500°F finish, you want to pull the roast earlier than you think. The temperature rises during the rest, then can rise a bit more during the final sear.
- Rare: pull at 110°F to 113°F, finish around 120°F to 125°F
- Medium-rare: pull at 115°F to 118°F, finish around 125°F to 130°F
- Medium: pull at 120°F to 123°F, finish around 130°F to 135°F
USDA guidelines for whole cuts of beef focus on safe handling and resting. For prime rib, a thermometer and a proper rest are your best tools.
Why is my prime rib tough?
Most often it is overcooked or sliced wrong. Cook to temperature, rest properly, then slice against the grain. Also, if your roast is very lean, avoid blasting it at high heat for the entire cook.
Can I prep the roast the day before?
Yes. Season the roast (salt plus the herb mixture), set it on a rack, and refrigerate uncovered overnight. On cooking day, let it sit at room temperature for 1 1/2 to 2 hours before roasting.