The primary ingredient used in lasagna is pasta sheets, specifically the wide, flat noodles called lasagna noodles. These noodles serve as the base for the dish and are layered with various fillings to create its signature structure. Traditional lasagna includes other essential ingredients such as ricotta cheese, mozzarella cheese, marinara sauce or meat sauce, and sometimes vegetables like spinach or mushrooms. The dish is baked in the oven, allowing the layers to meld together and create a delicious, comforting meal. Lasagna is a beloved Italian dish enjoyed in various variations worldwide.