Bring all ingredients except parsley to a boil in a 12-quart stockpot over medium-high heat, then immediately turn down to a bare simmer. Continue to simmer, uncovered, for at least two to three hours and up to six or longer; for the right simmer, look for a few bubbles to slowly rise to the surface every now and then.

If you have used the vegetable trimmings (see note) instead of or in addition to whole veggies, there will be no need to skim the broth. If not, skim any foam as it rises to the surface.

If there is a lot of meat left on the carcass, pull bones out as soon as the meat has softened enough to easily remove from the bones, usually about 45 minutes to an hour into the cooking process. Remove the meat and refrigerate it. Replace the bones and continue to simmer for another hour and up to five.

Add parsley about two hours before you plan to stop cooking, then continue to simmer till stock is rich and flavorful. When finished, skim any vegetable matter from the top of the stock, then strain stock. Cool stock about 20 minutes, skim fat from surface, or divide up into containers and cool, then skim fat after it has hardened on the surface.

Note on straining: pressing hard on solids when straining will result in a cloudy stock; some feel it’s more flavorful. It’s your call. Some strain through a colander, but for very clear stock, strain twice. The second time, line with an old cotton towel or paper towels. If there is residue in the pot left when the stock has been reduced, it’s concentrated flavor. Use a little of the strained stock to melt it off if possible, then add back to the stock.

Use as a base for soup or portion and freeze.

Notes:

• There is no salt in this broth, add to taste when finished.
• Using vegetable trimmings: save up the trimmings from any carrots, celery, and onion (skins and all) and use them to make a “raft” across the top of the soup. They will naturally clarify the soup.
• Watch the soup for liquid level, especially when simmering a long time.
• Safety: If you make large amounts of stock, cool it quickly by putting in smaller containers, cool on the counter to warm, then place in the fridge, uncovered, until chilled. Metal bowls help the heat dissipate faster.
• Broth keeps well for about three to four days. If you haven’t used it or frozen it by then and it still seems fresh, bring it to a rolling boil before using.