Preheat oven to 400 degrees.

Rub the outside of the bird with butter and sprinkle bird with salt.

Roast the bird for 40 minutes at 400 degrees breast side down.

Flip the bird and cook at 325 degrees until it reaches an internal temperature of 155 - 165 (between 3-4 hours).

Baste the bird every 25-30 minutes and turn it in the oven 180 degrees halfway through cooking.

Let the bird rest for another 30 minutes before carving.