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Glaze: Combine all glaze ingredients in a saucepan and reduce by one-half over medium heat. Strain and set aside.
Turkey: Preheat oven to 350°F (180°C). Cut onion into roughly 1 cm slices and place at the bottom of a roasting pan. Remove frozen turkey from bag and place in the roasting pan on top of the onion. Cover and place in oven immediately. After 3 hours, insert a cooking thermometer into thickest part of drumstick without touching bone.