Remove the neck bone and the giblets from the turkey and discard.
In a bowl add your softened butter and the rest of the rub ingredients and mix together until combined.
Pat the outside of the turkey dry with paper towels.
Use your hand and make a pocket underneath the skin of the turkey breast and add half of the butter mixture and spread it underneath the skin.
Spread the remaining butter mixture all over the rest of the turkey.
Stuff the turkey cavity with the lemons, onion, and remaining garlic.
Place the turkey upside down on the roasting rack and place in the oven. Lower the heat to 325.
Depending on your turkey size, your cooking time will be different. CLICK HERE for a handy cooking time chart.
When HALF of your cooking time is up, take the turkey out of the oven, turn it over (breast side up) and place back in the oven for the second half of cooking. (see notes) Don't worry about the marks from the rack. The breast meat will plump right back up.
Cook until the temperature reaches 165 degrees in the thickest part of the breast meat. Remove from oven and let rest for at least 15 minutes before carving.
Notes
The internal temperature of the turkey should come to 165 degrees F when done. Check in the thickest part of the breast.When flipping your turkey, don't try to lift it or grab it with bare hands. Use silicon oven mitts and gently roll it over. You could also use turkey lifters but I have done this many times with the silicon gloves and it's by far the easiest way. THESE ARE THE ONES I HAVE.