The main ingredient in a traditional margherita pizza is San Marzano tomatoes, which are known for their rich flavor, sweetness, and low acidity. These tomatoes are typically grown in the volcanic soil of the San Marzano region near Naples, Italy. A classic margherita pizza is made with a thin crust, topped with a simple sauce made from crushed San Marzano tomatoes, fresh mozzarella cheese (usually buffalo mozzarella), and fresh basil leaves. The pizza is traditionally baked in a wood-fired oven, resulting in a deliciously crispy crust and harmonious flavors.