Someone called Mythili, in the US, has been inspired by a conversation with her ((I know, stereotyping, but …)) grandmothers to concoct a series on traditional small grains of India. Mostly recipes, although she may be gathering other kinds of traditional knowledge too from her grannies. Be interesting to see where Mythili’s blog goes with this, but I think interviewing grandparents is a good way for children to get a feel for agricultural biodiversity.
Of course, if you don’t have the sort of relationship in which you can simply talk to older people (or, indeed, anyone) fear not. Help is at hand, in the form of something called an Earth Dinner. I kid you not. The helpful folks at Organic Valley have produced a set of cards you can buy that ask questions like “Describe a family recipe …” Could be valuable if someone were to collate all the results.