how long to cook boneless leg of lamb
1 boneless leg of lamb (about 4 to 5 lbs) 2 tablespoons fresh rosemary 2 tablespoons fresh thyme 2 tablespoons fresh oregano 4 cloves garlic Olive oil Salt & pepper. Preheat the oven to 450ÂºF. While the oven is heating, finely chop the herbs and garlic or use a food processor like we did.here are so many variables that decide how long to cook the lamb but it ranges from 25 minutes to 35 minutes per pound. Therefore a 5 pound leg of lamb could take 2 hours to 3 hours and then add the resting time.