Cider Brined and Glazed TurkeyBrine
4 quarts apple cider, divided
1 1/2 cups kosher salt
1/4 cup whole allspice
8 bay leaves
4 quarts cold water
1 20-pound turkey (neck and gizzard reserved)
2 cups apple cider
1/2 cup (1 stick) unsalted butter
Simmer 1 quart apple cider, salt, allspice, and bay leaves in 20-quart pot 5 minutes, stirring often. Cool completely. Add remaining 3 quarts cider and 4 quarts water. Place turkey in brine. Cover and refrigerate overnight.
Drain turkey and lightly rinse. Arrange on several layers of paper towels in roasting pan. Refrigerate uncovered overnight.
Boil cider in saucepan until reduced to 1/4 cup, about 15 minutes. Whisk in butter. Cool completely.
Set rack at lowest position in oven; preheat to 350°F. Remove paper towels from roasting pan. Pat main and neck cavities of turkey dry; stuff loosely with stuffing. Place turkey in pan, tuck wings under, and tie legs together loosely.
Roast turkey 1 hour. Brush with some of glaze. Roast until beginning to brown, about 1 hour. Cover with foil. Roast until thermometer inserted into thickest part of thigh registers 175°F, brushing with glaze every 30 minutes and adding up to 1 cup water to pan if drippings begin to burn, about 3 hours longer. Transfer turkey to platter; tent with foil. Let stand 30 minutes.