When oven is ready, place roast in shallow roasting pan and roast for about 1 hour.
While pork is cooking, combine cornstarch, cinnamon, salt and orange peel in small saucepan. Stir in orange juice, sherry and cranberry sauce. Cook, stirring over medium heat until sauce combines and thickens. Set aside.
After 1 hour, remove pork from oven. Set onion wedges around pork loin in pan and spoon about 1/2 of cranberry sauce over roast and onions. Return to oven for another 30 to 60 minutes or until internal meat temperature reaches 145 degrees F.
Remove from oven. Let stand 5 minutes. Serve with remaining cranberry sauce.