I remember all too well the food served in public schools back in the day. In high school, the main course offerings were, um, basic: “Lasagna” (perfect square, little piece of bread to go with it), Salisbury “steak”, Filet-o-”fish”, and yes, a perfectly rectangular piece of pizza. I also recall actual vegetables, like green beans and salad (nondescript iceberg lettuce with cherry tomatoes).