Preparation
1. Use a sharp knife to cut down both sides of the backbone and remove from the bird. Flip the turkey over and flatten the bird by pressing down on the breastbone until it cracks. Tuck the wing tips under to prevent burning.
2. Mix Cajun rub ingredients and massage generously over the entire bird, including under the skin if possible.
3. Preheat your grill to 375°F for indirect cooking: turn on outer burners to high, leaving the center burners off.
4. Place a drip pan under the center grates to catch drippings and prevent flare-ups.
5. Place one probe in the thickest part of the breast, another in the thigh. Connect to the Monument Grills app for live monitoring.
6. Lay the spatchcocked bird skin-side up over the center (indirect heat zone).
7. Close the lid and cook until breast reaches 160°F and thigh hits 175°F—about 2 hours depending on size.
8. Remove turkey and tent with foil. Rest for 20–30 minutes. Carryover heat will bring the breast to a perfect 165°F.
9. Carve and serve with Cajun butter (melted butter mixed with any remaining Cajun rub).