Onion-Orange Lamb Roast

3/4 leg of lamb
1/4 cup chopped onion
1/2 cup orange juice
2 tablespoons prepared mustard
3/4 teaspoon rosemary
Salt and pepper to taste

Place lamb on rack in shallow roasting pan. Roast in 325 degree F oven 30 to 35 minutes per pound or until meat thermometer registers 175 degrees F for medium doneness.

Combine onion, juice, rosemary and seasoning and spoon over the lamb during the last hour of roasting time.