I remember reading the book "The Man Who Saved Britain" [0] (a history of Bond novels & movies) and the author was describing some of the exotic foods, such as an avocado, being something the readers were unlikely to experience in a world of currency controls and import restrictions. One thing that pops up in that book is why the package tour industry was invented and how it applied to Goldfinger.

My suspicion is that some of those "exotics" appeared only in novels and the cookbook authors never expected their readers to ever be able to make the items.

0 - https://www.amazon.com/Man-Who-Saved-Britain-Disturbing/dp/0...