The main ingredient in a calzone is typically pizza dough, which acts as the pastry encasing the filling. Calzones are essentially folded pizzas, allowing for various fillings such as cheese, meats, and vegetables. This Italian dish is characterized by its portability and the ability to customize flavors. The dough is usually made from flour, water, yeast, and salt, providing a satisfying, hearty base for the delicious contents hidden inside.