Storage: Allow to cool completely before covering. Store in the refrigerator for up to 3 days. Reheat gently in the oven or enjoy cold.
Substitutions: If you cannot find fresh fennel leaves, you can use finely chopped fresh fennel bulb, though the flavor will be milder. Anchovy essence can be replaced with a small amount of anchovy paste dissolved in the milk.
Tips: For a blind bake option, you can pre-bake the pastry for 10 minutes before adding the filling if you prefer a crispier crust.
Variations: Add diced cooked bacon or ham for a heartier version, or include other soft shellfish like shrimp.