Remove the chicken from the refrigerator 30-45 minutes before preparation.
Remove the chicken gizzards from the middle of the chicken.
Pat it dry with a paper towelPreheat grill to 400°.
Lay the chick on a cutting board breast-side down.
Find the backbone down the middle of the back.
Using sharp kitchen shears, cut on both sides of the backbone and remove it.
Flip the chicken over, and press down on it to flatten.
Lift a corner of the skin and add the cubes of butter.
Mix the herbs and spices and liberally coat both sides of the chicken.
Place the chicken, skin side down on the grill over direct heat for 10 minutes or until the skin starts to carmelize and crisp.
Flip the chicken over and cook until the internal temperature is 160-163° (Chicken should be cooked to 165° but removing it from the gill a few degrees early will allow the chicken to continue to cook while it is resting.)
Remove the chicken from the grill, cover it with foil, and let it rest for 15-20 minutes.
Carve and serve the chicken.