Place chicken parts and cold water in a large 8-quart stockpot.
Add apple cider vinegar and allow to rest for 20 minutes at room temperature.
Bring the liquid to a gentle boil, then immediately reduce to a low simmer.
Skim and discard any foam or impurities that rise to the surface.
Add onions, carrots, celery, garlic, ginger, parsley, bay leaves, and peppercorns.
Simmer uncovered for a minimum of 4 hours, ensuring the liquid stays just below a boil.
Strain the broth through a fine-mesh sieve into a clean container, discarding solids.
Season with salt to taste and cool rapidly before storage.