I'm actually kinda familiar here despite being young and I'm going to show my pickiness here:
Blech lol. I'd eat school pizza, but there's no way you'd get me to eat sausage pizza, and there was one kind of pizza that I remember my elementary school (I believe?) used to serve that I thought was disgusting when I tried it.
Although I'm not sure I ever saw the rectangle pizza, it might have just been triangle back in the early to mid 00's. Granted my memory is bad though.
Truthfully, I'm not sure I'd be able to eat anything that is school lunch based anymore. I can remember during the pandemic, we managed to somehow get some chicken sandwiches that would be served to kids at school if they were there, and while it was edible, I thought it was just soooooo bland.