What makes a great pizza, or pizza Margherita? Is it the rich, sweet flavour of the San Marzano tomato sauce, the right amount of creamy buffalo mozzarella, the fresh hit of basil or the perfect balance of all three? David spends time with Gino Sorbillo, whose family has one of Naples' oldest pizzerias, in the hopes of uncovering the secret to making the best pizza in the world. He also tries some classic Neapolitan street food, pizza fritta and pizza a portafoglio, and helps teach a group of children the art of making and eating pizza.