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1
Make compound butter: Remove leaves from 4 thyme sprigs and 1 rosemary sprig and finely chop. Roll up 3 sage leaves and finely chop. In a small bowl, combine butter, garlic paste, lemon zest, and chopped herbs. Add salt and pepper to taste. Can be made up to 5 days ahead.
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2
When you're ready to cook the turkey: Preheat the oven to 325u00b0F, setting a rack in the lower third (larger turkeys should go on the lowest rack).
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3
Prep the turkey: Place the turkey on a large, clean work surface. Remove giblets and neck, and pat dry with paper towels inside and out. Slide hand between skin and breast meat to loosen skin. Rub the compound butter over breast meat, under the skin. Do the same with the leg and thigh meat sections. Shower the turkey inside and out with salt and freshly cracked black pepper. Stuff the cavity with the lemon, onion, remaining garlic cloves, and remaining herbs. Truss the legs and pin or tuck in the wings.
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4
Fit a rack (flat, not V-shaped) into a roasting pan. Place the roasting bag (seam side up) on top of the rack. Place turkey in the center of the roasting bag, leaving some room at the bottom of the bag. Fans of gravy with giblets and neck meat can toss the turkey neck and giblets (removed from their pouch) into the bag as well. Close the roasting bag by rolling upward and inwards towards the turkey.
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5
Roast for 2 hours and 15 minutes (for a 12-pound bird), up to 2 hours and 45 minutes for a 14-pound bird. It should take approximately 12 minutes per pound.
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6
Remove turkey from the oven, and raise oven temperature to 425u00b0F. Carefully unfold the bag, being careful of the hot steam. Use scissors to cut down the seam, and then horizontally across the short end. Alternately (and as shown in the photo), you can carefully cut an X into the top of the bag (watch the steam) without unrolling the bag.
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7
Roll down roasting bag so that the turkey skin is exposed on all sides (so we get crispy skin!). Return to the oven and roast, uncovered, until the internal breast temperature reaches 165u00b0F and the skin is a nice golden brown, about 45 minutes more.
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8
Remove just the turkey from the roasting pan, onto a large cutting board, and loosely tent with foil. Allow to rest for 30 to 45 minutes. As the turkey rests, carryover cooking will increase the meat temperature a bit more, about 5u00b0 to 15u00b0F. Remove the trussing string and discard aromatic vegetables and herbs inside the cavity, before carving and serving. If using the giblets and neck: Remove from the bag and let them cool for a bit before removing the meat from the bones and chopping the giblets to your liking.
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9
Meanwhile, make the gravy: Carefully tilt the bag to pour the juices (there should be a lot!) into the roaster. Discard the bag and remove the rack. Carefully pour the juices in the pan into a small pot or measuring cup. Place the roasting pan over a stove burner on medium heat. Melt the butter. Once the butter is foaming, whisk in the flour. Once the mixture turns a golden color, slowly add the juices from the turkey bag, whisking constantly to prevent lumps. Slowly add stock and keep whisking until gravy thickens, about 5 minutes. If you're using the giblets and turkey neck meat, you can stir it in now. Simmer and add more stock, to your liking, for another few minutes. Season to taste with salt and pepper. Serve right away.
