Quinces are wonderful fruits related to apples and pears, most varieties are too hard or sour to eat when raw, but they make an amazing treat: quince cheese, which is basically a jam that when set gets really hard because of the high content of pectin in the quinces.
They are in season in late Autumn.
When cooled down it’s cut in small rectangular pieces and eaten as a treat by itself or with butter and toasted bread.
In Sicily it was sold wrapped in oiled paper and brought to school to be eaten as a mid-morning snack. I haven’t seen them around for some years but maybe I haven’t looked hard enough!