Hmmm. I graduated three years ago. My school wasn't special or something, but the food was pretty good (it didn't look pleasant usually, but it was healthy and tasty anyway. You know, that kind of things which you should try first and only then you understand that it's good). We had breakfast and lunch. They were free for small children (1-4 grades) and for kids from big families or kids without a parent and so on. Others paid (or they could take a free lunch/breakfast instead a kid who didn't go to school that day but paid for food. But this option wasn't official)
Also, there were some snacks too, but for this "food" you always had to pay.