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1
Remove giblets and neck from turkey; place in a large saucepan, adding bay leaf, 1 celery rib, and half the onion. Add 6 cups water. Bring to a boil; reduce heat, and simmer, uncovered, 1 hour. Pour through a strainer. (You should yield 3 cups; add water if necessary to measure 3 cups.) Set aside.
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2
Rinse turkey with cold water. Drain; pat dry. Sprinkle body cavity with salt and pepper; place remaining celery rib and onion inside cavity. Close cavity; tie ends of legs together with heavy string. Tuck wingtips under bird. Place turkey in a lightly greased roasting pan, breast side up. Rub turkey all over with 2 tablespoons softened butter; sprinkle with 1 teaspoon salt and 1/2 teaspoon pepper.
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3
Roast, uncovered, at 325u00b0 until a meat thermometer reaches 180u00b0 in the thigh (about 3 hours), basting after 1 and 2 hours with remaining softened butter; turn turkey halfway through roasting. Baste frequently during last 45 minutes of cooking. Add 1 cup reserved turkey broth to roasting pan during last half hour of roasting. If turkey starts to brown too much, cover loosely with aluminum foil.
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4
Let turkey rest in pan 5 minutes; carefully remove to a serving platter or carving board. Cover with foil, and let rest up to 45 minutes.
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5
Meanwhile, prepare gravy. Skim excess fat from pan drippings, if desired. Working over medium heat on the stovetop, whisk flour into pan drippings until smooth. Whisking constantly, gradually add remaining 2 cups turkey broth; simmer 5 to 10 minutes or until gravy is thickened. Season with salt and pepper. Serve gravy with turkey. Garnish turkey, if desired.