Place broth and butter into a microwave safe bowl. Set on high for 1 minute until butter has liquified and broth has warmed. Remove from microwave and combine broth and melted butter with lemon juice. Add remaining ingredients and stir through. Let stand for 10 minutes, and stir through once more before using.
Prepare the bird by patting dry with paper towels. Load marinade into the meat injector, and slowly inject into multiple spots in the turkey. Be sure to really work the breast meat, as it tends to dry out during cooking.
If there is leftover marinade that you plan to use as a baste, place it into a saucepan, bring to a boil, reduce heat and simmer for 6-8 minutes on medium, or low. Let it cool for 10 minutes, and use as needed.
If you are not using the marinade as a baste, simply discard it. Do not save it in the refrigerator as it has come into contact with raw meat.