Storage: This soup keeps well in the refrigerator for up to 3 days. The flavors often deepen overnight. Freeze portions for up to 3 months.
Substitutions: If you prefer a lighter version, you can omit the chicken and use a rich vegetable stock, though it will no longer be traditional Cock-a-Leekie. Prunes can be substituted with raisins if preferred, though prunes provide a more distinct flavor.
Tips: For a clearer broth, ensure the simmer is gentle and do not boil vigorously after adding the leeks. Wipe the surface of the broth with paper towels if excess fat rises.