What are the layers of lasagna?

1. Bottom layer: a layer of cooked lasagna noodles

2. Meat sauce layer: a layer of meat sauce made with ground beef, pork, or veal, tomatoes, tomato sauce, herbs, and spices

3. Béchamel sauce layer: a layer of white sauce made with a roux (a mixture of fat and flour), milk, salt, pepper, and nutmeg

4. Parmesan cheese layer: a layer of grated Parmesan cheese

5. Noodles layer: a layer of cooked lasagna noodles

6. Meat sauce layer: a second layer of meat sauce

7. Béchamel sauce layer: a second layer of white sauce

8. Parmesan cheese layer: a second layer of grated Parmesan cheese

9. Noodles layer: a third layer of cooked lasagna noodles

10. Ricotta cheese filling layer: a layer of ricotta cheese filling made with ricotta cheese, spinach, eggs, herbs, and spices

11. Meat sauce layer: a third layer of meat sauce

12. Béchamel sauce layer: a third layer of white sauce

13. Parmesan cheese layer: a third layer of grated Parmesan cheese

14. Top layer: a final layer of mozzarella cheese (or a mixture of mozzarella and Parmesan cheese)

Note: Lasagna recipes can vary widely, and there are many variations on the traditional layers described above.