Pasta con le sarde is a Sicilian meeting of sea and herb: fresh sardines folded through pasta with green fennel. Culinary accounts treat finocchietto as more than a side note; they place it among the ingredients that make the dish itself. The leaves do not sit politely on the rim of the plate. They go into the cooking, so the pasta carries a wild, anise-bright lift beside the oil-rich fish.
That lift is the point. Wild fennel leaves give a documented Sicilian sardine pasta its defining aromatic character, the green thread you notice before the first bite and still taste after the last. One account prefers the wild plant for that reason, while allowing cultivated fennel tops as a practical stand-in when the hedgerow is empty. Either way, the cook is chasing the same thing: a sharp, herbal perfume that keeps the sardines from tasting only of the sea, and turns a simple bowl into something you lean toward.