Roasted Leg of Lamb

Got this recipe from Jamie Oliver. It came out pretty good! The meat fell right off the bone; however, I checked my lamb at 3 hours and it was done (even though recipe called for 4 hours). I would say after 2 1/2 hours check your lamb periodically with a thermometer for desired doneness.

Ingredients
For the lamb:
1 (2.2-pound) shoulder of lamb
Olive oil
Sea salt and freshly ground black pepper
1 large bunch fresh rosemary
1 bulb garlic, unpeeled, broken into cloves

Directions
For the lamb:
Preheat your oven to full whack, (450 to 500 degrees F). Slash the fat side of the lamb all over with a sharp knife. Lay half the sprigs of rosemary and half the garlic cloves on the bottom of a high-sided roasting pan, rub the lamb all over with olive oil and season with salt and pepper. Place it in the pan on top of the rosemary and garlic, and put the rest of the rosemary and garlic on top of the lamb. Tightly cover the tray with aluminum foil and place in the oven. Turn the oven down immediately to 325 degrees F and cook for 4 hours - it's done if you can pull the meat apart easily with 2 forks.