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1 Place leg of lamb on a rack in a roasting pan. 2  Preheat oven to 325 degrees and bake leg of lamb uncovered for 30 minutes per pound or until internal temperature reaches 120 to 130 degrees at the thickest point. Preheat oven to 325 degrees and bake leg of lamb uncovered for 30 minutes per pound or until internal temperature reaches 120 to 130 degrees at the thickest point.
Confidence votes 249. About 20-25 minutes per pound, so 2 hours for a 4 pound lamb, slightly longer if you want it more well done but be careful not to make it tough by overcooking.However, the lamb, to be at its tender best after cooking must be allowed to get to room temperature first.ooking a 2.8Kg leg of lamb will take approximately one and a half hours. First, pre-heat the oven to 390 degrees F. Place the lamb in a roasting pan and pour 3/4 cup of win â¦ e into pan. The lamb is seasoned accordingly.