This oddly-shaped cake pan has the words "DO NOT REMOVE FROM THE COBB'S KNOB KITCHENS" stamped into it. If you used it to bake a cake, underneath the frosting there would be a message that you could only read in a mirror. Since there aren't any mirrors in the Cobb's Knob kitchens, though, that means that you'd have broken the rule before you even found out about it.
Logic is hard.
(Cooking ingredient) Cannot be traded or discarded Quest Item