Residual Heat or Carry-Over Cooking:
Residual Heat or Carry-Over Cooking: Remember, the rib roast will continue to cook as it sets. The temperature will rise to 125 degrees F. to 130 degrees F. internal temperature (medium rare) at 15 to 20 minutes. If allowed to rest as long as an hour, the temperature will rise even higher. So, pay attention to how long you let the cooked prime rib roast sit.
Definition: Carry-over cooking is caused by residual heat transferring from the hotter exterior of the meat to the cooler center. As a general rule, the larger and thicker the cut of meat, and the higher the cooking temperature, the more residual heat will be in the meat, and the more the internal temperature will rise during resting due to carry-over cooking. This means the meat must be removed from the heat at an internal temperature lower than your desired final internal temperature, allowing the residual heat to finish the cooking.