Here at Nettuno, the third-generation producer Giulio Giordano ages his anchovy sauce for three years to make sure it's the perfect color and flavor. But how exactly is this sauce made?

Its crust is thicker, but the rest of the pizza is arranged in order: crust, sauce, cheese and toppings. The history of pan pizza is murky. Some claim it was invented by the Giordano family in ...