- To a large stockpot, add bones and fill with cold water, covering bones by about 1 inch. Bring to a boil.
- Meanwhile, add onions, carrots, celery, garlic, herbs, bay leaves, salt and peppercorns. Once boiling, add vinegar.
- Reduce heat and simmer for at least 5 hours or up to 48 hours, partially covered, adding additional water if needed. The longer you simmer, the more nutrients and flavor you’ll extract from the bones. After simmering for longer periods of time, the marrow should have all come out of the bones (leaving them hollow). If any marrow remains, use a spoon to remove it so that it doesn’t go to waste. You can eat it off the spoon, or even try spreading it on toast.