Place the turkey into a large resealable bag. Add the dressing. Turn to coat. Refrigerate overnight.
Start up your grill for two-zone (direct and indirect) cooking.
Salt and pepper the turkey, to taste.
Lightly sear the turkey over high heat then move to indirect heat and cook until the internal temperature reaches 170 F. Remove and let rest at least 15 minutes. Slice thin against the grain.
Lightly toast the buns or rolls, if desired.
Slather the buns with the Comeback sauce.
Add turkey.
For a classic sandwich
Top buns with sliced turkey, lettuce, onion, and tomato. Serve.