Two days before cooking, make the marinade by mixing together ½ cup salt, 2 tablespoons black pepper, 2 tablespoons granulated sugar, ¼ cup liquid smoke, ¼ cup soy sauce, and ¼ cup minced garlic. Cover and refrigerate overnight.
The day before cooking, place the approximately 7 pound uncut prime rib roast on a rack in a large roasting pan. Pour half of the marinade over the roast. Flip the roast over and pour the remaining marinade over the other side.
Cover and refrigerate the roast overnight.
On the day of cooking, let the prime rib sit at room temperature for 1 hour before cooking.
Preheat the oven to 450 degrees Fahrenheit.
Bake the prime rib at 450 degrees Fahrenheit for 30 minutes until the outside is seared and browned.
Reduce the oven temperature to 250 degrees Fahrenheit.
Continue cooking for 2–2 ½ hours depending on your preferred doneness. Use a meat thermometer to monitor the internal temperature. Start checking after 2 hours and continue checking every 15 minutes until the roast reaches your desired temperature.
Remove the prime rib from the oven and cover loosely with foil. Let it rest for 1 hour before slicing.
Slice the roast against the grain into approximately ½ inch thick slices.
Serve with your favorite sides and enjoy!
Notes
Here are the approximate time and temperatures needed based on how you like your prime rib cooked.Rare – 120 degrees Fahrenheit Medium Rare –130 degrees Fahrenheit Medium – 140 degrees Fahrenheit Medium Well – 150 degrees Fahrenheit