Are there any school lunches from your childhood that you remember as being very tasty?

In the 60’s they used to feed us this hamburger gravy stuff. I loved it! It was so good! I tried to recreate it when I was in my 20’s, but I couldn’t. The first time I figured it was because I used quality ingredients, ground chuck and whole milk, so the second time I used the cheapest hamburger and used powdered milk. Still couldn’t copy it.