Place bones in a large pot and cover with water. Bring to a boil.
Add the vegetables, herbs, and peppercorns.
Reduce heat and skim the surface of any debris – push the foam to the edges of the pot with a ladle for easy removal. Cover and simmer on low for 6 – 8 hours.
Strain into a large mixing bowl and refrigerate for a couple of hours to allow any fat to surface and solidify for easy removal.