on May 14, 2012
at 11:49 PM
I don't have a link or site reference to prove it, but I'd say that intuitively, removing the skin first, chopping out any nasty bits (eyes or "runners") then giving it a good washing before cooking would be best.
I pressure cook by veggies, so there's always some water in the bottom of the pressure cooker in contact with whatever I'm cooking.
If the skin is the tuber's self defense mechanism, then I don't want any of it immersed in a bath of "weapons of mass destruction".