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1
Heat oil in heavy large saucepan over medium-high heat.
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2
Add neck, heart, and gizzard, then celery and onion; saute until deep brown, stirring often, about 18 minutes.
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3
Add 6 cups water and bring to boil, scraping up browned bits.
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4
Reduce heat to medium-low, cover, and simmer 1 1/2 hours.
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5
Strain stock into large measuring cup and reserve; discard solids.
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6
DO AHEAD Can be made 1 day ahead.
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7
Cool slightly, cover, and chill.
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8
Place turkey on rack in large roasting pan.
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9
Mix onion, apple, 1/2 teaspoon salt, 1/2 teaspoon pepper, and thyme in bowl.
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10
Spoon mixture into main turkey cavity.
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11
Tuck wing tips under; tie legs together loosely to hold shape.
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12
Rub oil over turkey; sprinkle with 3 teaspoons salt and 1 teaspoon pepper.
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13
DO AHEAD Can be made 1 day ahead.
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14
Cover with plastic; chill.
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15
Position rack in bottom third of oven and preheat to 400F.
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16
Roast turkey uncovered 45 minutes.
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17
Reduce oven temperature to 375F.
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18
Roast turkey 1 hour.
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19
Turn pan around; pour 1 cup turkey stock over.
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20
Roast until thermometer inserted into thickest part of thigh registers 175F, about 1 hour longer.
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21
Transfer turkey to platter; tent loosely with foil and let stand 30 minutes (internal temperature will rise 5 to 10 degrees).
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22
Reserve pan juices for gravy.
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23
Blend butter and flour in small bowl to smooth paste.
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24
Tilt roasting pan; spoon off fat from pan juices.
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25
Place pan over 2 burners on medium-high heat.
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26
Add Port and 1 cup turkey stock; bring to boil, scraping up browned bits.
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27
Transfer to large saucepan.
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28
Measure 3 cups turkey stock, adding chicken broth if needed.
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29
Add to saucepan and bring to boil.
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30
Whisk in flour paste.
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31
Boil until gravy is thick enough to coat spoon, whisking occasionally, about 15 minutes.
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32
Season gravy with salt and pepper.