This recipe adds a sweet and tangy twist to the classic Sarde a Beccafico by incorporating caramelized onions and balsamic vinegar into the stuffing for the sardines. The caramelized onions add a sweet and savory flavor, while the balsamic vinegar provides a tangy note. The sardines are stuffed with a mixture of breadcrumbs, caramelized onions, pine nuts, raisins, and olive oil. The dish is then baked until the sardines are crispy and the stuffing is golden brown.
