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1
Put the turkey in a brining bag set in a tub or very large pot.
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2
In a large saucepan, combine the cider with the salt, 1 cup of the brown sugar and the rosemary, thyme and sage and bring to a simmer, stirring to dissolve the salt and sugar.
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3
Add 6 quarts of cold water to the brine and pour over the turkey.
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4
Add the ice to the brine and refrigerate the turkey overnight.
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5
Preheat the oven to 450 and set a rack on the lowest shelf of the oven.
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6
Drain the turkey and pat dry.
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7
Discard the brine.
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8
Fill the turkey cavity with half of the onion, celery, carrot and garlic cloves; scatter the remaining vegetables in a large roasting pan.
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9
Set a V-shaped rack in the pan.
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10
Tie the turkey legs with butcher's twine and transfer the bird to the rack, breast side up.
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11
Add 2 cups of water to the pan and roast the turkey for 30 minutes.
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12
Meanwhile, in a small saucepan, combine the remaining 1 cup of brown sugar with the 1 stick of butter and the bourbon and heat just until the sugar and butter melt.
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13
Reduce the oven temperature to 350 and brush the turkey with some of the glaze.
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14
Continue roasting the turkey, brushing it every 15 minutes, for about 3 hours, until an instant-read thermometer inserted into the thigh registers 165; add another 2 cups of water and tent the turkey with foil halfway through roasting.
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15
Transfer the turkey to a carving board and let rest for 30 minutes.
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16
Strain the pan juices into a heatproof bowl and skim off the fat.
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17
(You should have about 1 cup.)
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18
Discard the vegetables.
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19
In a large saucepan, heat the oil.
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20
Add the chopped turkey giblets and cook over moderate heat until lightly browned, about 5 minutes.
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21
Add the pearl onions and cook until lightly browned in spots, about 5 minutes longer.
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22
Add the turkey stock and the reserved turkey pan juices and bring to a boil, scraping up any browned bits from the bottom of the saucepan.
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23
In a small bowl, mash the remaining 2 tablespoons of butter with the flour and whisk it into the gravy.
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24
Bring to a boil and simmer until the gravy thickens, about 5 minutes.
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25
Whisk in the roasted garlic.
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26
Carve the turkey and serve with the gravy.