When Israel’s Ida Kleinman passed away in 2010, aged 91, she was determined not to take her famous recipe for nut cake to the grave. She gave instructions to have it engraved on her tombstone. Now visitors to Rehovot Cemetery can view it anytime, or alternatively at these on-line sites.
https://www.findagrave.com/memorial/235667149/ida-kleinman
https://www.nytimes.com/2022/06/30/dining/gravestone-recipes.html