The froth. Add the celery, the garlic, the parsley, the salt, the thyme, and the bay leaf and simmer the mixture for 4 hours. If a more concentrated flavor is desired, boil the stock until it is reduced to the desired concentration. Strain the stock through a fine sieve into a bowl and let it cool to warm. Chill the stock and remove the fat. The stock keeps, covered and chilled, for 1 week if it is brought to a boil every 2 days and th en allowed to cool to warm, uncovered, b
Makes about 8 cups.