[DIYbio] Re: How difficult would it be to make a super food?

This is more just mental masturbation than anything, but does anyone have an ideas on how much work would be required to make a food that hits all the appropriate daily values of everything (essential vitamins included) for a Human from a single source, say a mushroom?  Are all the metabolic pathways and associated enzymes and genes known already for the synthesis of each of the essential vitamins?  Would those pathways compete with each other negatively, or would they more or less work in parallel without stepping on eachother's toes?  Mushrooms are kind of arbitrary, and I know I've heard potatoes are close, but are there other things that don't require direct sunlight and aren't animals?  (Again, this is just a curiosity, I don't want to paint myself as some kind of vegan.)