Method
Combine all ingredients in a large nonreactive container and mix until salt and sugar have mostly dissolved.
Submerge the birds completely in the brine, ensuring they are weighed down or fully covered.
Refrigerate overnight (about 12 hours) to brine the chicken.
Next day, remove the chicken from the brine, rinse under cold water and pat dry thoroughly.
Cook the chicken as desired (roast, grill or smoke) following your preferred method.
Notes
Use a brining bucket or other container to keep birds submerged. I use Newfoundland Savoury (Mount Scio) here, but dried savoury works well too.