A cliffside restaurant in Positano, a retirement celebration, and a plate of spaghetti alla Nerano changed everything—including my mind about zucchini.Credit: Allrecipes / Kim Shupe / Alexa Mellardo / AdobeLast September, my Italian family and I traveled to the Amalfi Coast to celebrate my dad's retirement, with Positano as our home base. After a full day sailing the Mediterranean, we stumbled into Ristorante Bruno, a cliffside spot with mosaic …