Gipsy Tart, the once a term block of mostly melted icecream, tinned peaches and the once a term roast potatoes.
Everything else was pretty much disgusting (the stew with beans in was vaguely palatable, even though, according to my mother, who was a dinnerlady at one point, it was largely soya mince,tinned carrot, tinned beans and gravy with lard melted in), but food at home wasn't much better (except for the salads) and probably contributed to my being pathetically underweight and malnourished for much of my childhood.
I do remember being very upset that a Muslim girl was given a big pile of grated cheese on a plate because there was usually pork or lard hidden somewhere in every recipe and I wasn't allowed to have the same because 'cheese is only for people whose religion says they can't eat meat'. Many lunchtimes were spent patiently waiting for the furious harridan that would smash spoons onto tables and scream for silence and smack ten year olds when nobody was looking to stop yelling at me about the Poor Starving Children in Africa and I was being given this food for free, so should be grateful for it - ironically, we weren't allowed to eat whilst a dinner lady was speaking to you, so it was in your interests to wind them up enough that she went on a long rant. That finally stopped around the time a new teacher started coming into the hall and saying I was needed for something and had to come immediately whether I had finished my lunch or not.
The best thing that happened in food terms for me was going to high school, as they made jacket potatoes and, if you were on free school meals, because they knew you weren't allowed to spend enough to get a potato, topping, salad and a 'pudding' (I seem to remember it being 76p a day at one point - potato (30p), topping (15p), salad (15p) sweet item (20p)), they would sneak a flapjack, apple or yoghurt to you underneath the tray.
Whilst you couldn't force me as a child, you couldn't pay me to eat today's school dinners - most of them provide part baked rolls with fillings, but don't actually bother to bake the rolls a second time before sticking a smear of tuna inside. And the 'chicken' drumsticks or wings don't look like any bird I've ever butchered.
On INSET days, it's compulsory to eat what is supplied as a unit and I have sat there for the entire time drinking water, even when being told I'm not demonstrating a team mindset. I don't give a flying fricassee, I'm not eating that shit even though you're forbidden to leave the premises to get something identifiable. I just scarf down something from home whilst ostensibly tidying/hiding in a large cupboard