Actually, chicken stock.
We save all our roasted chicken carcasses in the freezer after we've picked them clean. About twice a year, get out my 30 qt stockpot, about 8-10 chicken carcasses, some whole onions, heads of garlic, few bunches of celery, some peppercorns, salt and various herbs. Cook all day, then strain off solids and cool. Skim fat off top when cool and the stock is like jello, measure out into ziplocs and freeze. I used to measure into Tupperware, but like how little room 15 quarts of stock takes up in ziplocs.