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1
Grind dried porcini in processor until almost reduced to powder, with some larger bits remaining, about 4 minutes.
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2
Transfer to sieve.
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3
Shake powdered porcini into bowl; mix in 2 tablespoons butter.
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4
Reserve larger bits in sieve.
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5
Rinse turkey inside and out; pat dry with paper towels.
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6
Place turkey on small rack set in large roasting pan.
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7
Rub porcini butter over outside of turkey; sprinkle with salt and pepper.
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8
Bring porcini bits and chicken broth to boil in small saucepan.
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9
Remove from heat; reserve for basting.
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10
(Turkey and porcini broth can be made 1 day ahead.
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11
Cover separately; chill.)
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12
Set rack at lowest position in oven and preheat to 325F.
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13
If stuffing turkey, spoon stuffing loosely into main cavity and neck cavity.
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14
Tuck wing tips under; tie legs together loosely.
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15
Roast turkey 1 hour 15 minutes, covering loosely with foil if browning quickly.
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16
Toss onion, carrots, garlic, and oil in bowl to coat; scatter in pan around turkey.
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17
Baste with 1 cup porcini broth.
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18
Continue to roast turkey until thermometer inserted into thickest part of thigh registers 175F, basting with 3/4 cup porcini broth and pan juices every 45 minutes, about 2 hours 30 minutes for unstuffed and 3 hours for stuffed.
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19
Transfer turkey to platter; let stand 30 minutes (internal temperature will increase 5 to 10 degrees).
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20
Place roasting pan over 2 burners.
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21
Add turkey stock and any remaining porcini broth and bring to boil, scraping up browned bits.
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22
Strain turkey broth into heavy large saucepan; spoon off fat.
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23
Mix 4 tablespoons butter and flour in bowl to form paste.
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24
Melt 3 tablespoons butter in large skillet over medium heat.
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25
Add mushrooms.
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26
Cover; cook until mushrooms release liquids, stirring occasionally, about 8 minutes.
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27
Add Madeira; boil until wine evaporates, about 2 minutes.
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28
Add mushroom mixture to turkey broth; bring to boil.
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29
Whisk in flour paste.
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30
Reduce heat to medium; simmer until gravy thickens, whisking occasionally, about 5 minutes.
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31
Season with salt and pepper.
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32
Serve turkey with gravy.