There are generally 5 categories ...with an additional miscellaneous for anything that doesn't fit . Some prime examples have been included to aid your understanding
DIRT FOOD Celery is the ultimate food of wrongness. But also in this category we have beetroot , marrow, marmite !!!!!!
FISHAll categories with the exception of fish and chips and that is only cod in batter .
SOCK FOODGoats cheese .Halloumi. Feta etc
BABY FOODSemolina. Rice Pudding. Tapioca etc .
AWFULOffal - absolutely all forms including black pudding / tripe etc
MISCELLANEOUS Coffee / tea , marzipan