WebPlace roast in a roasting pan fat-side up. Arrange half the rosemary in the bottom of the pan around the roast. Roast 30 minutes, then reduce heat to 350º and …
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Place a drip tray below the prime rib and fill it with 2 cups of beef stock or water. Sear the meat on the rotisserie with the rear burner on high for 15 to 20 minutes or until there is a lovely crust on the outside. Reduce the rear burner heat to medium, the grill should fall to a temperature around 275ºF to 300ºF.
PRO TIP: Prime rib roasts about 15 to 20 minutes per pound of meat. If you don’t have a meat thermometer handy or want to ensure the perfect roast, this is a good way to judge the doneness of your meal. Your prime rib roast is done when a meat thermometer inserted into the center reads 135ºF for medium-rare.
Your prime rib roast is done when a meat thermometer inserted into the center reads 135ºF for medium-rare. Remove the roast to a board using heat resistant barbecue gloves, then carefully remove the rotisserie rod and forks as they are still hot and will increase the heat inside the meat.
Season the roast with the garlic, chopped rosemary (and/or thyme), and black pepper, pressing the herbs and pepper into the meat gently. Tie the roast securely between each bone with butcher’s twine. This will ensure that the bottom cap does not come loose and the roast will cook evenly.