Genre fiction

I knew that there were certain broad categories that fiction writing falls into, such as western, romance, adventure, mystery, fantasy, horror, historical, and science fiction. I'd even heard of some subcategories, such as police procedural mysteries. But at a book sale recently Judy picked up a book that was categorized (by Entertainment Weekly) as a "culinary whodunit" -- a category that seems to be populated almost entirely by one author, Diane Mott Davidson, at least as shown by a Google search. I don't draw any conclusions here, just a bit of amusement...