The main ingredient in traditional lasagna is pasta sheets, specifically those made from semolina wheat. These sheets are layered with various fillings, including ricotta cheese, mozzarella, and a meat or vegetable sauce, often made with tomatoes. The dish is assembled in layers, alternating between pasta, cheese, and sauce, creating a rich and flavorful meal. The way the pasta is cooked can vary; some recipes call for pre-cooking the sheets, while others use no-boil varieties that cook during the baking process. Lasagna is a beloved Italian dish, commonly enjoyed in many adaptations worldwide.