I see discussions sometimes about developing recipe applications for #ActivityPub/AS2. In that spirit, I wrote a blog post describing how to use the schema.org Recipe type in an AS2 conformant manner. It's mostly a thought exercise about possibilities since most AP implementations won't render an AS2 conformant recipe correctly, if at all.
https://www.stevebate.net/extending-activitypub-a-recipe/

I wanted to be able to search and browse the #ActivityPub Fediverse Enhancement Proposals (FEPs) so I converted them to an Obsidian vault. As a nice side-benefit, I can now view the graph of FEP dependencies and their color-coded status (green=FINAL, yellow=DRAFT, red=WITHDRAWN).