Its actually all there, a web implementation, a mobile app, and all the code is on github, but the initiative stumbled on the finish line (which il say is my fault). I think the NIPdocumentation and a presentation about it are the parts that never got published as such. I happen to be sick today, but il see if i can find all the links for you at some point. The relay and web-app are not hosted anywhere currently. Also the NIP/eventkind, was rather janky. The idea was to be creative with markdown in the content-field in such a way that (non recipe focussed) clients could opt for a barebones/simplefied implementation of the render/NIP; but i was never satisfied how it got implemented in the two demo apps(web and android), so i doubted it was a good idea (i.e. perhaps the idea was too fancy and would only make things worse for implementation) The event kind provided structured info about recipe relevant data, allowed for flexible rendering and subsequent additional processing on recipe data (allergies, portioning/amounts etc.)

Oh and i forgot, i think the code for transforming the old longform-recipes into the new events-structure is also there; iirc it was not perfect-perfect, but pretty good.