I went to a lot of different schools growing up. Some of them were not-very-well-funded public schools, but others were international schools for expats and private US schools – some of which might qualify. Most of the schools I went to had a cafeteria with a typical “go through the line with a tray and get whatever they cooked that day in bulk” kind of system. Some of them also had a store where you could buy snacks, prepackaged sandwiches, and such. I remember bringing lunch from home a lot – either sandwiches or leftovers from dinner the previous night, usually. One of the schools was so small it didn’t even have a real cafeteria for us and all the students (6th~8th grade in the US system) brought lunch from home and ate on fold up chairs in the multi-purpose room every day. I also went to a boarding school for a couple years. That one had a cafeteria system too – but the students were pressed into working on a rotation schedule (wiping down tables, cleaning dishes, and such – I don’t remember preparing any of the food). I don’t recall anything particularly outstanding one way or the other about the regular lunches there, but that one had periodic formal dinners (once a month or so, IIRC) where I had to get dressed up (e.g. put on a tie) and they broke us up into small groups of students and teachers. I remember those being stressful, but also having better than average food.