I went to Catholic school in the Chicago area. Each lunch consisted of a hot pack & cold pack.
The good ones:
Hot dogs & mustard
Burrito
Tacos
Awful:
Pizza. The hot pack consisted of a rectangle with a 1/4" thickness of bread, red sauce, and alleged cheese, heated. (Remember Chicago does pizza well, but this stuff was awful). The cold pack came with a banana & cole slaw most of the time. Otherwise it was a banana and Jello with prunes. And wash it all down with chocolate milk I've never had cole slaw, pizza, chocolate milk and a banana in the same meal. Come to think of it, I've never had it in he same day. ick.
When the guys hit 6th grade, the food portions were simply not enough, we'd wind up eating 2 of every hot pack.