In a mixing bowl combine the salt, pepper, sage, rosemary and thyme together. Separate the skin from the breast and apply the dry brine between the skin and turkey meat, inside the cavity, and then any remainder on the skin.
Place on a sheet pan with a baking rack and refrigerate for at least 24 hours and up to 3 days.
Roasting the turkey
Bring the turkey out of the refrigerator and allow to come to room temperature for an hour.
About 15 minutes before you are ready to bake preheat the oven to 350°F, 177°C or gas mark 4.
While the oven is preheating fill the cavity of the turkey with the garlic, apple, celery, and onion. Take the butter and place it between the skin and breast meat. Get it as far under the turkey skin as possible.
Bake covered for 1 hour. Remove the cover and pour the apple cider over the turkey and baste every 25-30 minutes.
At the two hour mark check the internal temp every 15 minutes until the temperature reaches 165°F or 74°C.
Making gravy (optional)
In a skillet cook the turkey organs and neck, if included, with ¼ cup butter until browned. Add ¼ cup flour and cook for 2 minutes or until the raw smell disappears. Add the drippings from the turkey and water until the desired thickness is reached.
Notes
Brining time is 1 hour per pound so if you don't have 24 hours you can still brine your turkey if you have 10-18 hours before you want to cook it.