The main ingredient in lasagna is pasta sheets, which are specifically designed for layered dishes like this traditional Italian meal. Lasagna is typically made by alternating layers of cooked pasta with various fillings, including cheese (such as ricotta, mozzarella, and parmesan), meat (ground beef or sausage), and sauce (often a marinara or béchamel sauce). This layering process creates a hearty and flavorful dish that is baked until hot and bubbly. Different regions and families may have their own variations, but the pasta sheets play a crucial role in giving structure to the entire dish, making it a beloved comfort food.