Add Roasted Bone/Vegetable mixture to a large stock pot or divide between two large pots. Top with 24 cups of water or until bones are covered by 1" of water.
Add bay leaf, cinnamon stick, star anise, peppercorns, and apple cider vinegar.
Bring to a boil and then simmer on low heat for 8-12 hours.
Place cheese cloth or cotton dishtowel lined colander on top of a large bowl and carefully pour broth through lined colander. Make sure to check the bowl periodically while strained to not overfill the bowl. You will probably have to strain in batches.
Allow broth to cool to room temperature and add into container you intend to store your broth in. Refrigerate over night.
(Optional) Skim fat layer off the top of the gelatinized broth.
Keep refrigerated for up to 5 days or store in the freezer in a freezer safe container for up to 6+ months.