How long do you roast a 2.12 lb prime rib bone in?

The recommended roasting time for a 2.12 lb prime rib bone-in is approximately 2 hours and 15 minutes at 350 degrees Fahrenheit. However, the exact cooking time may vary depending on the oven temperature, the size and shape of the roast, and personal preferences for doneness. For best results, it's important to use a meat thermometer to ensure that the internal temperature of the roast reaches the desired level. Here's a general guideline for roasting a 2.12 prime rib bone-in:

1. Preheat the oven to 350 degrees Fahrenheit (175 degrees Celsius).

2. Season the prime rib generously with salt, pepper, and any desired herbs or spices.

3. Place the prime rib in a roasting pan with the bone side down.

4. Roast the prime rib for approximately 15-20 minutes per pound, or until the internal temperature reaches 120-125 degrees Fahrenheit (49-52 degrees Celsius) for rare, 130-135 degrees Fahrenheit (54-57 degrees Celsius) for medium-rare, or 140-145 degrees Fahrenheit (60-63 degrees Celsius) for medium.

5. Let the prime rib rest for at least 15-20 minutes before carving and serving.

Remember to always use a meat thermometer to accurately determine the internal temperature of the roast to ensure that it is cooked to your desired doneness level.