San Marzano tomatoes make a superb marinara sauce. Seventy-five years of experience have taught us that these tomatoes are the very best. On the San Marzano plain near Salerno, Italy, soil and weather conditions combine to create superior tomatoes. These San Marzano tomatoes are truly unique with fewer seeds and lower water content. Their pulp creates a thicker, more flavorful sauce especially prized by Italian cooks all over the world since it is both sweet and tart at the same time.