San Marzano tomatoes are a type of Italian plum tomato that is prized for its sweet, rich flavor, firm texture, and low acidity. The San Marzano tomato is considered to be one of the best tomatoes for making sauce, and it is especially popular among chefs and foodies. The San Marzano tomato is a protected variety, with only those grown in the Sarnese-Nocerino area of Italy being certified as true San Marzano tomatoes. San Marzano tomatoes are often used in Italian cuisine, particularly in dishes such as pasta sauces, soups, and stews. They are also popular in American cuisine, especially in dishes such as pizza and tomato sauce.