makes 1.8 litres/3pt
Put all the ingredients in a large stockpot or heavy saucepan, and add 3 litres/5pt water. Set over a high heat, bring to the boil, then skim off any scum from the surface.
Reduce the heat and simmer, uncovered, for about 40 minutes, continuing to skim off scum from the surface as it rises. Carefully strain the liquor through a fine-mesh sieve, and discard the seasonings.
Allow to cool, then refrigerate until needed. Use on the same day the stock is made, or divide into portions and freeze until needed.