In a large pot, combine 4 cups of the water with the salt, granulated sugar, and honey. Heat over medium-high heat, stirring until the salt and sugars dissolve completely.
Remove from heat and add the peppercorns, dried thyme, dried rosemary, and bay leaves.
Add the remaining 12 cups of cold water. Stir and let the brine cool completely.
Place the turkey in a large brining bag or a container large enough to hold the turkey and brine.
Pour the cooled brine over the turkey, making sure it's completely submerged.
Seal the bag or cover the container and refrigerate for 12-24 hours.
Before cooking, remove the turkey from the brine, rinse it thoroughly under cold water, and pat it dry with paper towels.
Discard the brine after use.
Notes
Don't skip rinsing the turkey after brining. This removes excess salt from the surface.Pat Dry: Make sure to pat the turkey very dry after rinsing.This helps achieve crispy skin when roasting. If you're using table salt instead of kosher salt, reduce the amount to 3/4 cup.