Neapolitan means anything relating to Naples Italy.
In this case, food.
It's the center of high class food in Italy.
It is home of the original pizza, served to Queen Margherita.
Pizza Margherita is a typical Neapolitan pizza, made with San Marzano tomatoes, mozzarella fior di latte, fresh basil, salt and extra-virgin olive oil. Together with Pizza Marinara, it is the most popular Italian pizza.