If using a whole chicken, cut off the wings and remove the neck, fat glands and the gizzards from the cavity. Cut chicken parts into several pieces. Place chicken or chicken pieces in a large stainless steel pot with water, vinegar and all vegetables except parsley.
Let stand 30 minutes to 1 hour. Bring to a boil, and remove scum that rises to the top. Reduce heat, cover and simmer for 6 to 8 hours. The longer the stock cooks the richer and more flavorful it will be. About 10 minutes before finishing the stock, add parsley. This will impart additional mineral ions to the broth.
Remove whole chicken or pieces with a slotted spoon. If using a whole chicken, let cool and remove chicken meat from the carcass. Reserve for other uses, such as chicken salads, enchiladas, sandwiches or curries. Strain the stock into a large bowl and reserve in the refrigerator until the fat rises to the top and congeals. Skim off this fat and reserve the stock in covered containers in the refrigerator or freezer.
