La San Marzano Four Cheese Sauce is made by a family-owned, 45-year-old business that boasts all-natural farming and processing, including fresh vegetables and pure olive oil. The base of this authentic sauce is real San Marzano tomatoes, grown and harvested on Mt. Vesuvius' foothills, combined with Parmigiano-Reggiano, Asiago, Pecorino Romano, and Trentingrana for a rich and tasty sauce.