Thanks so much, oshun!  Yes, the toxin could be fungal-derived ergotamine, or it may be inherent in the grain itself (my theory).  An example of another toxic but important foodstuff is <a href="http://www.sciencedaily.com/releases/2003/05/030514080833.htm">cassava</a>, which must be processed properly to diminish its cyanide content.

Thanks a million for taking a look at this little slice of life among the post-docs and grad students. :^) The exact identity of the grain used for lembas is a mystery to me - some sort of temperate zone monocot based on old Pengolodh's notes, but one that must harbor some unusual secondary metabolite. Yep, I tend to think there was some tension among the Noldor and the rest of the tribes.

I think it is still conceivable that perhaps once there was no toxin in it, but after Ungoliant savoured the trees and poisoned it, she might have been more menancing and poisoned more plants of the Valar.

Now that is an intriguing interpretation!  I like it! That would be consistent with Ungoliant's destruction predilections and the stain on Valinor.  That in turn makes me wonder if Ungoliant's toxin ("dark power") may have given the plant the ability to resist decay and disease.  So perhaps an evil intention ends up inadvertently conferring something beneficial?

Your comment got me to thinking about the crop's backstory and Midhel's later thoughts. 

It may be that Yavanna knew full well of the toxic properties of this mysterious crop -- and may even have put the toxic properties in place herself  -- not as anything pertaining to Arda Marred, but as a means for the plant to protect itself against insect pests and disease.  Yet the remarkable nutritional (feeding body and spirit) properties of the grain far outweighed the risk of toxicity to the Firstborn.  So Yavanna, being a wise Vala (and to my mind a first-rate horticulturalist and botanist), performed her own risk assessment and taught her first accolytes how to handle to grain so that the toxicity was diminished.  The process likely got ritualized and became holy. 

I'd like to think Midhel found a new way to look at lembas with wonder.  Knowing the "science" behind lembas, she might appreciate the ritual that much more since she would be aware of Yavanna's elegant scientific approach and thoughtful assessment of the good outweighing the bad.

Heh.  Well, I went on and on about that!

On OCs.  It's a risky path since many fan fic readers prefer to read about canon characters, so  I'm relieved that you like these folks!  Not only do I like to write OCs, but I also like to read OCs!

Thanks so much, Rhapsy for the compliments and for the thought-provoking comments; you're very good at coming up with those! :^)

No review is ever too late! :^D

Although the story is meant to stand on its own with its themes of faith versus skepticism and culture clashes that can nonetheless be bridged, I can see how this might give some insight into these two OCs' characters.  I also think that Midhel and Mélamírë will have some more stories together in the future -- I see the little furry toes of plot bunnies if not their whole bodies!

Thanks so much for reading and commenting, ww!