Man I think I'm the only person that misses school lunch. Country fried "steak", scalloped potatoes, green beans, 2 rolls, 2 milks. My high school even had "heart attack on a plate wednesdays": biscuits and gravy with hash browns.
In all seriousness, at schools like the one I went to, in a very rural part of the state where 95% of the kids are either on free or reduced lunch, it's the school's job to pump them full of calories because those kids probably won't be eating again until they get back to school tomorrow. After all, mommy and daddy have to also pay for beer, marlboros, mt. dew, and cable tv (with their welfare check). Can't be bothered to actually cook dinner for the pain in the ass kids.
Anytime we had an early dismissal day, they never let us out until after lunch, because if we let out before lunch, most of the students wouldn't get to eat lunch that day.
It really comes down to the most food the school system can buy on their limited budget.