Defrost the turkey in the refrigerator for at least 24 hours before roasting.
Preheat your oven to 325°F
Rinse off your defrosted turkey in a clean sink with the faucet on a low setting so you don't spray salmonella all over your kitchen. Remove the gravy packet from the turkey cavity, wash the packet with soap and water, and then keep it so you can make some gravy later.
Pat your clean turkey dry with some paper towels.
Rub your turkey with thyme, sage, pepper, and kosher salt.
If you want, you can also mix up some room temperature butter with the salt, pepper, sage, and thyme, and rub it under the turkey skin.
Place chopped veggies and garlic in the bottom of roasting pan or large casserole dish with 2-3 cups of stock.
Fill cavity of turkey with some of the chopped vegetables, along with a chopped lemon or orange (optional), and place turkey on top of veggies.
Roast in oven until internal temperature reaches 165°F. Refer to turkey roasting times in notes.
Remove from oven, tent a piece of foil over turkey, and allow to rest for 20-30 minutes, then transfer turkey to a large cutting board and allow to sit for another 20-30 minutes, until it's cool enough to handle.
Strain liquid left in roasting pan, reserve the liquid for gravy, and discard vegetables.
Once turkey is cool enough to handle, remove skin, and carve off each breast.
Reserve turkey carcass if making turkey stock.