I've been working from my favorite Asian cookbook for several years now (Hot Sour Salty Sweet by Jeff Alford & Naomi Duguid) and I have finally been able to locate a regular supply of all of the exotic ingredients they use - EXCEPT ONE: coriander roots. It's the root ball of the plant that produces cilantro. They can be frozen & grated into curry pastes and grill rubs and such. I once heard that Chinese groceries sell cilantro bunches with roots attached, but I've never seen this. I can't get them at the Farmer's Market either. I live in the Raleigh Triangle area & we have great Asian stores, but no coriander roots that I've been able to find. Has anyone got a source?
PS don't say that the stems are a substitution, because I haven't had good luck with that!