Remove skin from turkey. Place turkey in a slow cooker.
Squeeze half a lemon over the turkey and sprinkle with Lemon Pepper Grill Seasoning or Honey Lime Rub. Place lemon halves under turkey. Cover and cook on low for 5-7 hours or until meat is no longer pink. Discard lemon halves.
For gravy, pour cooking liquid into a measuring cup and skim the fat off.
In a saucepan, combine cornstarch and broth until smooth. Gradually stir in cooking liquid. Bring to a boil, cook and stir for 2 minutes or until thick.