Whisk together the oil, vinegar, garlic, parsley, dill, and oregano. Butterfly the lamb and pepper generously on both sides. Cut some slits in the meat. Marinate the lamb for 2 to 24 hours.
Drain marinade from lamb and put lamb in 425° F oven in shallow roasting pan for about 45 minutes. You want an internal temperature of 135° F. Let lamb rest before serving.Servings: