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Preheat oven to 425 degrees F. In a medium roasting pan or Dutch oven, place boneless leg of lamb roast and make 15 inserts with a paring knife. Stick garlic slice into each opening until you run out of garlic.
Rub roast with oil all around. Then sprinkle one side with half of rosemary, salt and pepper. Turn around and repeat on another side.
Bake uncovered according until desired doneness. Remember meat will keep "cooking" as it rests.°Medium Rare: 130 - 135 degrees F internal temperature - about 16 minutes/lb.°Medium Well: 140 - 145 F internal temperature - about 18 minutes/lb.°Well-Done: 150 - 155 F internal temperature - about 20 minutes/lb.
My best advice for 4-5 lbs roast is to check internal temperature after 1 hour and go from there. For 2-3 lbs roast, check after 45 minutes. It all comes down to checking often after a certain period of time towards the end.
Remove lamb roast from the oven and let rest uncovered for 15 minutes.
Using a sharp knife, remove the casing and slice into 1/4 inch slices against the grain. Serve warm at a celebration table or use cold leftovers in sandwiches or salads.