This discussion feels so alien to me. 
Australian school lunches, a looong time ago. 1-2 sandwiches, white bread. Peanut butter & jam, or devon (sliced meat *product*, porkish) with a dollop of tomato sauce. Some kind of fruit. All from home, no refrigeration. There were water bubblers for drinks—& smalll state supplied unrefrigerated bottle of milk for morning play lunch.
Anything else was suspicious. 