Defrost turkey in the fridge at less than 40 degrees F for 3 full days (4 lb per day). You may have to take it out for 4-5 hours the day before if turkey is still not partially defrosted by then. Pad dry the turkey with paper towel.
Lay the vegetables on the roasting tray and put the defrosted, unwrapped turkey after removing the innards and cutting off excess fat/skin. Season the back and inside of the turkey with half the spice mix: lemon pepper spice, five spice powder, vegetable spice, garlic powder, onion powder, 1 tbsp black pepper.
Tuck in the wing tips. Pre-heat the oven to 350 degrees F.
Stuff the inside of the turkey with cut parsley, onion, lemon, garlic cloves. Tie up the turkey legs with butcher twine.
Make herb butter: butter, salt, 1 tsp black pepper, chopped parsley, lemon juice, oil, minced garlic. Apply all the herb butter over turkey. Season the turkey with the rest of the spice mix. Spray with oil.
Bake in the pre-heated oven at 350 degrees F for 3 hours until an internal temperature of >170 degrees F.