Prime rib on the Barrel House Cooker's middle level.
Prepare the prime rib for cooking and let rest until room temperature.
Mix 1 cup olive oil, minced garlic (6-7 cloves) and 1/4 cup black pepper into a paste (or use your own preferred prime rib rub).
Rub the paste on all sides of the prime rib.
Once the cooker is lit according to instructions, set prime rib on a grate on the middle level of the cooker. Close the lid.
Cooking Temperature: When properly started, the temperature inside the barrel should be 275-315°F; however, the thermometer will typically read between 220-260°F. The lid thermometer shows a lower temperature than where the food is cooking because it is affected by the exhaust.
Let cook for about 2-2.5 hours before checking the internal temperature. The internal temperature should range between 120-140°F depending on your preference.
Remove the prime rib from the Barrel House Cooker using high-temp BBQ gloves, such as the Pit Mitt®.
Let rest for about 30 minutes before slicing.
Pair with horseradish sauce (optional) and you're ready to enjoy!