By Mayo Clinic Staff. Yellow tongue â a yellow discoloration of your tongue â is usually a temporary, harmless problem. Most often, yellow tongue is an early sign of a disorder known as black hairy tongue. Rarely, yellow tongue may be a sign of jaundice, a yellowing of the eyes and skin, which sometimes indicates liver or gallbladder problems.
Grab a shallow pan and place the prime rib in it with the bone side facing down. Roast it at 450 degrees F for 15 minutes to sear the outside, and then turn the oven down to 350 degrees F. Continue roasting the prime rib for 45 to 90 minutes, depending on how done you like your meat. Check it by inserting an instant-read thermometer in the meatiest part of the roast.
Your cooking times will vary depending on the size of your prime rib roast. To calculate your cooking time, multiply the exact weight of the roast by 5. Round the resulting number to the nearest whole number. The rib is cooked at 500 degrees F for exactly that many minutes. For example, for a 6 pound roast: 6x5=30, so cooking time is 30 minutes. Turn the oven off and wait 2 hours before opening the oven door. Remove the prime rib and slice into the most perfectly medium-rare meat you've ever seen.