If you want extra juicy meat, start brining 18 to 24 hours before cooking. I always plan ahead and brine the day before. A good turkey brine recipe seasons the bird deeply and keeps it moist during the long smoke.
Set your smoker to 250°F and add your apple wood. Give it time to settle at a steady temperature. I like to wait until I see thin, clean smoke before the turkey goes in.
Spray a large disposable aluminum pan with cooking spray. Set the turkey in the pan and tuck the wings under the body. This keeps the wings from burning and helps the bird sit nicely.
Fill the cavity with the quartered onion, quartered lemon, and fresh herb sprigs. Then tie the legs together with kitchen twine. These simple aromatics add lovely flavor and moisture from the inside.
Sprinkle the BBQ rub all over the turkey. Cover the breast, legs, wings, and back. I like to pat it in gently so the rub clings to the skin.
Place the turkey in the smoker and cook for 5 to 6 hours. If you skipped the brine, baste with chicken broth every 30 to 45 minutes. If you brined, leave it alone and refill the wood as needed.
If the skin gets dark too fast, loosely cover the turkey with foil. This protects the skin while the meat keeps cooking. I do this about halfway through when I see the color deepening.
Cook until a thermometer in the thickest part of the thigh reads 165°F. Do not rely on the clock alone. Smokers vary, so the thermometer always has the final say.
Let the turkey rest for 10 to 15 minutes before carving. This lets the juices settle back into the meat. Move it to a platter, garnish with fresh herbs, and carve into thick smoked turkey slices.