Ingredients
One 3-bone Beef Prime Rib Premium Oven Roast (about 7 lb/3.15 kg)
1 tbsp (15 mL) coarse sea salt
1 tbsp (15 mL) olive oil
1 tbsp (15 mL) Montreal-style steak spice (approx)
Instructions
- Pat roast dry with paper towel. Rub all over with salt and let stand for 5 minutes. Rub all over with olive oil, then with steak spice, liberally rubbing it into the meat.
- Load fire bowl of kamado-style grill with natural lump charcoal in an even 2-inch (5 cm) thick layer. Light the charcoal with a paper towel in the coals or charcoal-safe fire starter and place the diffuser plate in the fire bowl. Fill a foil drip pan part way with water and place on the plate (see Tip). Place the grill grate over the diffuser plate. Close lid and preheat to Low (250°F/121°C), adjusting the top and bottom vent to achieve this constant temperature.
- Place the roast on preheated grill, insert an oven-safe programmable thermometer sideways into roast and close the lid. Cook for about 3 hours or until thermometer registers 125°F (52°C).
- Transfer partially cooked roast to a clean plate and set aside. Remove the diffuser plate and drip pan; lower the grill grate closer to the charcoal for high-temperature, direct-heat grilling. Brush the grate clean and close the lid. Adjust vents as necessary to heat to a temperature of about 600°F (315°C); this should take about 2 to 5 minutes.
- Return roast to grill, close lid and sear over high heat for 3 to 5 minutes per side or until thermometer registers 145°F (63° C) for medium-rare (or 160°F/71°C for medium, or 170°F/77°C for well-done).
- Transfer roast to clean plate, gently tent the roast with foil to retain a small amount of heat but allow the steam to exit. Let rest for 20 to 30 minutes.
- Transfer roast to a cutting board and carve into thick slices to serve.
Notes
Gas Grilling Method: You can use the reverse-sear method in a three-burner gas grill, too! Simply turn on the two end burners, leaving the centre burner off; place drip tray over unlit burner. This is your indirect heat zone, where you’ll put your roast. Turn the end burners to low heat and preheat grill to 250°F (121°C). Cook roast in closed barbecue over unlit burner for about 3 hours or until thermometer registers 125°F (52°C).). Remove the roast and drip pan from the grill. Turn all burners to High and preheat for about 10 minutes, until the grill is 600°F (315°C). Return roast to grill, close lid and sear over high heat for 3 to 5 minutes per side or until thermometer registers 145°F (63° C) for medium-rare (or 160°F/71°C for medium, or 170°F/77°C for well-done).
Tip: If you have a half-moon plate/griddle diffuser accessory for your barbecue, cook roast over the diffuser for the indirect heat cook, and then transfer roast to side directly over the coals to sear and complete the cooking. If you don’t have any type of diffuser, push the charcoal to one side and place the drip pan under the grill on the other side for indirect-heat cooking. When ready to sear, move the roast over to the live coal side of the grill.
