[header] How to make bone broth [title] Use cartilaginous bones. [substeps] Collagen, which is found in cartilaginous bones like the joints, neck, head and feet, renders gelatin. For chicken broth, use 2 chicken feet in addition to the other bones. 
For beef broth, use sections of a calf's foot. You can find these things at your local butcher, or you can ask your local farmer to bring you some.