You may simply get rejected based on the fact they have a book in print or in the pipeline on the same subject.
Are there any foods coming down the pipeline that might need recipes or merit further explanation? John Grisham had a book rejected sixteen times before it found an agent and other famous authors have similar stories.
But I hope these questions and suggestions give you a good introduction to the process — good luck! Others marry rich, which is not a joke! This is just a sampling of the many cookbooks in the Library of Virginia collection.
A section entitled "Kitchen and Household Hints" provides suggestions on gravies, tenderizing meat, what to do with leftovers, cleaning tips, removing odors, and removing mildew among other information. Do You Click?
Sometimes local cookbooks can be a challenge to catalog if there is no source of publication or date. All are reasons to write a book.