I just heard something on NPR. Put them in a paper sack and keep them cool, but not frozen. Also, the person - who was promoting a book, "Roots" - said if you slice and bake them at 200 degrees for 24 hours the inulin will turn to fructose. Anyway, I typed inulin and
sunchoke into a search engine and found this:
http://healthyhabitscoach.wordpress.com/2008/11/21/be-careful-with-sunchokes/