Pizza estimated that annual production of pizza cheese was in the U.S. and in Europe. Authentic Neapolitan pizza ("pizza napoletana") is made with San Marzano tomatoes, grown on the volcanic plains south of Mount Vesuvius, and mozzarella di bufala Campana, made with milk from water buffalo raised in the marshlands of Campania and Lazio. This mozzarella is protected with its own European protected designation of origin. Other traditional pizzas include "pizza alla marinara", which is topped with marinara sauce and is supposedly the most ancient tomato-topped pizza, pizza capricciosa, which is prepared with mozzarella cheese, baked ham, mushroom, artichoke and tomato,
San Marzano Oliveto returned to Asinari control. It was subsequently transformed into a country residence. The town hall dates from 1889. It is a multipurpose building that houses local government offices, a primary school, and the post office. The Parish Church of San Marziano was built in classic Renaissance style with a neoclassical nave, presbytery and choir. Located in front of the castle, it was founded in the thirteenth century, enlarged from 1758 to 1763, and restored in 1843. The economy of San Marzano Oliveto is based on agriculture. The arable land constitutes 75% of the total area; about 300 people are engaged