Step 1

Prepare stuffing according to package directions, and set aside in a large bowl.

Step 2

Preheat oven to 350 degrees F (175 degrees C).

Step 3

Bring water to boil in a medium saucepan over medium heat, and stir in the onion, celery and sage. Boil 10 minutes, or until the onion is soft. Stir into the prepared stuffing.

Step 4

Rinse turkey, and pat dry. Loosely fill the body and neck cavities with the stuffing mixture.

Step 5

Place turkey in a large roasting pan and cook 3 to 3 1/2 hours in the preheated oven, or until the internal temperature of the thigh meat is 180 degrees F (80 degrees C) and the stuffing is at least 165 degrees F (75 degrees C).