In a small saucepan, melt ghee and mix with tandoori marinade. Allow the mixture to cool.
Preheat oven to 375° F.
Carefully slide your fingers between the skin and breast meat of the turkey. Spread the marinade mixture under the skin and around the outside of the turkey.
Cut two oranges into quarters and place the sections inside the turkey cavity. Tie the legs together with twine and place the turkey breast-side up in a roasting pan.
Roast for 45 minutes. Baste the turkey with its juices, lower the temperature to 325 °F, and continue to baste every 20-30 minutes, for a total of 2 hours.
Roast until the skin is browned and the marinade forms a golden crust on the outside of the turkey. Insert an instant thermometer in the thigh to ensure that the internal temperature registers at least 155° F.
Tent with foil for 30 minutes. Garnish with remaining oranges, carve, and enjoy!