This kind of came up in the worst cookbook that you own discussion. In addition to actual worst cookbooks, there are "weird" cookbooks. Books that are pretty obscure or very limited in audience appeal. Doesn't mean they are your worst. But it does mean they are weird.
Here are my top two nominations from my cookbook collection:
"Bill Cook and Authentic Historical Recipes and Practices" by George Leonard Herter and Berthe E. Herter.
"A General's Diary of Treasured Recipes" by Brigadier General Frank Dorn.