Throw these in your crock pot, add some chicken feet, and a bloop of vinegar, and cover with water. Leave it set for an hour to allow the vinegar to pull the minerals out of the bones. Adding onions, carrots, and celery will give it more nutritional value, not to mention also adding flavor! Turn the setting to low and allow it to simmer for up to 24 hours. Strain and use broth as a base for soups and stews or simply drink it straight. Read how to make bone broth right here.