Not sure if it bothered anyone else enough to look, but I tracked down the missing source for the header image [1]. The U.S. Declaration of Independence [2] is another nice example of handwriting, but unlike a random, faded (and potential non-English?) recipe, it seems very legible and might not have helped the author's argument.

[1]: https://www.flickr.com/photos/calliope/5094055919/in/gallery...

[2]: https://upload.wikimedia.org/wikipedia/commons/8/8f/United_S...

edit: Phrasing