About the lack of inclusion of this meaning in a dictionary, I checked in my trusty bPetit/b Robert (a 1968 edition which is now badly in need of a replacement on my shelf) and while both "crotte" and "crottin" are included, I was shocked to see that their culinary meaning is not. ... And then in Fawlty-style regional bhotels/b in the UK, you put the toast in one of those absurd metal racks, to make sure that by the time it reaches the table it's cold and inedible. ...
