Cool project! One of my earlier projects for learning Scheme was a similar system whose selling point was automatic "smart" ingredient substitution. It's interesting that one of the key selling points of this is it's focus on quickness of search. I can't imagine having so many recipes that a computer would have a hard time searching through them, but then perhaps I'm just not the target audience :)

Aside: I know everyone loves to hate electron/web tech, but being an electronician myself, I can't help but wonder how a web-tech version of this would look. For one, it would be nice to be able to try this out, but the current version is unavailable on my platform (MacOS). An Electron or web version wouldn't have this problem, and a web version would work with an iPad or similar, which is a nicer kitchen tool than any keyboarded-device in my experience. Potential hanging points would be in parsing the recipes, and search. I'd imagine that for search it wouldn't be all that difficult to build up a sufficient index programmatically without mySQL, but I could be wrong. As for parsing, the examples I've seen seem all quite simple, but of course the difficulty in parsing is always the long tail.