Interesting video. It's not the way I make lasagna but the veggie prep gave me some ideas I may use.
My mother's family was from Southern Italy. She made lasagna that was very soupy and would not keep its structure when portioning. Her sauce was all tomatoes with onion, garlic, and herbs. It was very thin, which I understand is common for the Calabria region.
Once I started cooking for myself at university, I decided I wanted a thicker sauce. After I perfected that, it was time to try lasagna. In separate containers I put my 4 hour sauce, browned ground chuck, browned sausage, ricotta, mozzarella, and parmesan cheese. The key for me to structure was using uncooked or lightly blanched noodles.
My parents visited us a few years into our marriage. I made lasagna. My mom took one bite and said, "Son, this is better than mine." I've been making it that way ever since. It's no Michelin star, but it was the best compliment I could have ever received.
Hmm, going shopping today. Might have to make a lasagna soon.
Edit: I occasionally add fresh spinach and sweet basil to each layer. The flavors are very subtle and add a nice bit of color.
I've also made a white lasagna with no tomatoes, but it does include the spinach and basil. It's a completely different taste experience.