This recipe adds a rich and nutty twist to the classic Sarde a Beccafico by incorporating Gorgonzola and walnuts into the stuffing for the sardines. The Gorgonzola adds a creamy and tangy flavor, while the walnuts provide a nutty note. The sardines are stuffed with a mixture of breadcrumbs, Gorgonzola, walnuts, pine nuts, raisins, and olive oil. The dish is then baked until the sardines are crispy and the stuffing is golden brown.