Combine first 4 ingredients and 2 qt. water in a saucepan, and cook over
medium heat 5 minutes or until salt and sugar are dissolved. Remove from heat.
Divide liquid between 2 large (10- to 12-cup) bowls; add 4 cups ice cubes to
each bowl and enough cold water to make 10 cups of brine in each bowl. Stir
until ice melts and both mixtures are completely cool (about 5 minutes).
Remove giblets and neck from turkey, and reserve for another use, if
desired. Place turkey in an 18-qt. food-grade plastic container or stockpot.
Pour brine into cavity and over turkey, covering turkey completely. Place in
refrigerator. Cover and chill 24 hours, turning turkey once halfway through.
Combine butter and next 4 ingredients in a small bowl.
Preheat oven to 350°. Remove turkey from brine, discarding brine. Rinse
turkey well, including cavity.
Starting at neck, carefully loosen and lift skin from breast and drumsticks
using your fingers. (Do not totally detach skin.) Rub 3⁄4 cup butter mixture
under skin; carefully replace skin. Tie ends of legs together with string; tuck
wing tips under. Place turkey, breast side up, on a lightly greased rack in a
roasting pan; rub remaining butter mixture over skin.
Roast turkey at 350° for 1 hour and 45 minutes, basting with pan juices
every 20 minutes during last 45 minutes of cooking. Remove from oven, and
lay bacon slices, crosswise, over breast and drumsticks.
Return turkey to oven; roast 45 minutes to 1 hour or until a meat thermometer inserted in thickest portion of thigh registers 170°, basting every 15 minutes.
Let stand 30 minutes before carving. Garnish, if desired.