Tie ends of legs to tail with cord. Lift wingtips up and over back, and tuck under bird. Insert meat thermometer in meaty part of thigh, making sure it does not touch bone. Bake at 325 degrees until meat thermometer reaches 185 degrees. If turkey starts to brown too much, cover loosely with aluminum foil.
Turkey is done when drumsticks are easy to move up and down.
Let stand 15 minutes before carving. Cook over low heat, stirring occasionally, until celery and onions are softened, about 8 minutes. Bake in 350 degree oven 30 minutes. For turkey broth, put neck and giblets from the giblet bag in 4 cups water in saucepan. Simmer 1 hour.