OK, my search for Chilchin on the web gives me Rhus trilobata (skunkbush sumac)

I am not familiar with the plant myself so no help from me on how to use it.
Here are some sites talking about it

http://www.turtlelakerefuge.org/Turtle%20Lake%20Refuge/Webpages/Sumac.html

http://plants.usda.gov/java/profile?symbol=RHTR

I hit a couple of references to chilchin pudding too.