The nutrient rich volcanic earth of Mt. Vesuvius produces the highly praised tomatoes known as San Marzano. With fleshy pulp and minimal seeds, this variety is less acidic and sweeter than other varieties. Only those grown in the valley of the Sarno River can be classified D. O. P. San Marzano Tomatoes. (Denominazione di Origine Protetta which translates to Protected Designation of Origin.) Alessi San Marzano Peeled Tomatoes bear the D. O. P. mark, a distinction governed by Italian law which ensures integrity of the product.