Rinse the turkey with water, inside and out, then pat dry with paper towels (see notes). Remove any remaining feathers from the turkey with tweezers.
Rub the turkey all over with salt, slipping it under the skin where possible and rubbing some into the cavity—about 1 tablespoon per 5 pounds. Refrigerate for 1-2 days and let osmosis do its magic. Flip the bird halfway through the refrigeration, so that the skin dries out all over.
Combine the oil or melted butter, parsley, rosemary, thyme, sage, paprika, curry powder, allspice, white pepper, minced ginger, and garlic. This can be done the day before, and keep it in the fridge until ready to use.
After the desired dry brining time, take the turkey out of the fridge and dry it with paper towels (if necessary).
Generously rub it with the spice mixture, slipping it under the skin and into the cavity where possible. You can let it rest in the fridge for another 24 hours or roast it immediately. If refrigerating, take the turkey out of the fridge an hour before baking to bring it to room temperature.
Preheat the oven to 400℉ (205℃). Brush the turkey with oil or melted butter and any leftover spice blend.
Add carrots, celery, and onions to the bottom of a roasting pan, add a rack if you have it, and then place the turkey on top, breast-side up. Tie the legs of the turkey together with kitchen twine to help hold its shape. Tuck the wings underneath to stabilize the turkey when carving.
Position the rack in the lowest part of the oven. Roast the turkey for 30 minutes, then reduce the heat to 325℉ (165℃). Continue baking until an instant-read thermometer registers 165-170℉ (75℃) in the thickest part of a thigh, 2 hours or more, depending on the size of your turkey.
If the turkey is browning too fast, cover the breast and top of the drumsticks with foil to prevent overcooking.
Baste every 15-20 minutes up until 30-35 minutes before the turkey is done. Try not to leave the oven door open too long so the temperature doesn't drop.
Let the turkey rest for 15- 20 minutes before carving so the juices redistribute.