Preheat oven to 500F degrees. Remove tin foil and drain liquid from bottom of roasting pan. Place turkey back on rack in pan, breast side up.
Rub 1 tbsp olive oil over the skin of the turkey, then season with freshly cracked pepper to taste.
Place reserved neck, giblets, and heart in the bottom of the pan, along with 2 cups of chicken broth.
Roast until the skin begins to brown, about 20-30 minutes, then turn heat down to 350F degrees. Continue to roast until an instant-read thermometer inserted into the thickest part of the thigh reads anywhere from 160-165F degrees. This can take up to 3 hours for a very large turkey. My 13-pound turkey took only 1 hour and 45 minutes.
If it looks like the tips of the wings might start to burn, tent them with tin foil (see blog notes).
Check the dripping in the bottom of the pan every 30 minutes or so. You want them to concentrate and get very brown, but not burn. Add in more broth, 1/2 cup at a time, if the pan looks too dry. I added in about 1 extra cup total.
Remove turkey from oven. Take the bird off of the rack and let sit for at least 30 minutes before carving