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 tomato in the shadow of Mount Vesuvius. One story goes that the first seed of this tomato came to Campania in 1770, as a gift from the Viceroyalty of Peru to the Kingdom of Naples, and that it was planted in the area of San Marzano sul Sarno. In the United States, San Marzano tomatoes are the genetic base for another popular paste tomato, the Roma tomato. The Roma is a cross between a San Marzano and two other varieties (one of which was also a San Marzano hybrid) and was introduced by the USDA's Agricultural Research Service in 1955. San