Interesting. Also allows for some fun ‘expansion’ in recipes. A leaf node may be ‘chicken stock’ but you could link to a recipe that boils down to that one ‘chicken stock’ node if you want to DIY it.
We noticed one of our partner websites had an unusual number of unique ingredients. It turned out every ingredient was a link to another recipe to make that ingredient, along the lines of your idea.
However for some reason (presumably SEO) they took this to the extreme and everything was a recipe. Including apples.
The recipe for “apple” is
1. Take 1 Apple
2. Eat and enjoy
But since Apple is a prerequisite for this recipe, infinite looping is a risk in the kitchen now