The best way to judge a pizza is to go simple: Order a Margherita.
A Margherita is a Pizza with Tomato, Mozzarella, Basil, Olive Oil, and Salt.
A typical Neapolitan Pizza Menu boasts quite a few options, the most common being:
Tomato, Mozzarella, Basil
Tomato, Oregano, Garlic, and Olive Oil
Just Mozzarella and no tomato sauce.
Tomatoes, Mozzarella, and Anchovies and oddly can be called Pizza alla Napoletana in Rome.
Tomato, Mozzarella, Prosciutto, Mushroom, Artichoke, Olive
Same ingredients as Capricciosa but the pie is divided in 4, each slice getting a separate item
A Pizza with 4 different cheeses usually either: Mozzarella, Smoked Mozzarella, Provolone, Gorgonzola, Parmigiano, Fontina, etc
Tomato, Mozzarella, Salame Piccante (Hot)
Deemed a modern invention but quite popular nonetheless.
Escarole, Anchovies, Olives
Zucchini Flowers, Mozzarella (optional)
Friarielli are the tips of broccoletti and are like very thin broccoli di rapa. Further south from Naples, Friarielli are actually long hot peppers. In Naples, the Friarielli (the broccoli kind) are used on pizzas with Salsiccie (Sausages).
Cracklings (Rendered Pork Lard )
Borage Flower (a rare specialty, so rare most Neapolitans have never heard of it)
Chocolate Hazelnut spread
Calzone means “trousers” in Italian and refers to pizza dough folded over and stuffed with items such as cheese, meat, and /or greens. These half moon shaped, stuffed pizzas are either fried or baked. A Calzone may also called Pizza Chiusa, Panzerotto, or Mezzaluna.
Though Calzoni look similar to Stromboli, Stromboli are American inventions and unheard of in Italy. Perhaps the closest possible thing to a Stromboli is the Sicilian Bonata. Another popular, Sicilian specialty is the Pidone, which is similar to a Calzone and can be either baked or fried and is usually stuffed with endive, tomatoes, and cheese.
There is also a Sfincione di San Vito, which is similar to a calzone and filled with pork, sausage, and cheese. This Sfincione is not to be confused with the regular Sfincione, which is a thick, fluffy, square pizza.
Rarely seen outside of Naples, this a flat disk shaped piece of dough topped usually with tomato, mozzarella, and meat and covered with another flat disk shaped piece of dough. It is then fried.
A sandwich made with pizza dough and stuffed with meats and cheeses and cooked in a wood fired oven. This is a specialty of Gragnano and served with the equally special red sparkling wine called Gragnano.