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For making the vegetables, you should have seeds as an ingredient. Then to make seeds you need the vegetables, so you could have a cycle in your dependency graph.

Also you should keep adding recipes for seawater and soil etc until you have a recipe for creating the universe. And use an apple pie as your example recipe.

Haha. Yeah this is the chicken-and-egg problem. There are no cycles here since I'm working from the basis of primordial practical ingredients, in that each recipe should ideally boil down to just sun, soil, water, and seeds (be they fungi spores, cow embryo, chicken eggs, vegetable seeds, etc.). It would be neat to expand this to the universe though :)

Except when I click "egg" in the recipe it gives me instructions on how to produces eggs from an egg-laying chicken, then how to produce an egg-laying chicken from a chick... "how to incubate a chick from a fertilized egg" doesn't seem too out of scope.

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