Naples traditionally in a wood-burning oven, the ingredients of Neapolitan pizza have been strictly regulated by law since 2004, and must include wheat flour type "00" with the addition of flour type "0" yeast, natural mineral water, peeled tomatoes or fresh cherry tomatoes, mozzarella cheese, sea salt and extra virgin olive oil. Spaghetti is also associated with the city and is commonly eaten with the sauce "ragù": a popular Neapolitan folkloric symbol is the comic figure Pulcinella eating a plate of spaghetti. Other dishes popular in Naples include "Parmigiana di melanzane", "spaghetti alle vongole" and "casatiello". As a coastal city, Naples
San Marzano Oliveto prospered there in ancient times. This hypothesis is supported by the existence of an ancient olive press in nearby Santo Stefano Belbo, and by the fact that olives continue to thrive there, although not in any great quantity, to the present day. The first human settlers to the area came from Liguria, but the first extant buildings and documentary evidence of settlement date from Roman times. Tradition has it that the four towers, now collapsed, of the present castle were built by the Romans. The history of San Marzano, like that of Moasca, Calamandrana, Rocchetta Tanaro and Calosso, is linked