Sardinia now rivals its northern neighbor Provence as a vacation destination. The coastline lures visitors, but it is the food that will make you linger. Chef Efisio Farris is poised to become the next great ambassador of Italian regional cuisine. To promote the cooking of his native Sardinia, he has appeared on the Food Network, given demonstrations at food festivals across the country, and even launched his own company that imports Sardinian specialties for his restaurants and for retail. It is Mediterranean cooking at its purest, making liberal use of olive oil, fish, and fresh vegetables. But it’s also distinguished by indigenous ingredients that are becoming hot trends in America: pecorino, flatbread, fava beans, fregula, and bottarga. Farris has pulled together more than one hundred recipes–many of them family secrets. Among them are Watermelon Salad with Arugula and Ricotta Salata; Pannacotta with Bitter Honey; and Bruschetta with Sausage and Pecorino Sardo. More than 150...