a friend returned from the Cairo spice market with vaduvan and z'atar - which is which? http://twitpic.com/4a4df9
za'atar is on the left.
I wish I knew your friend!
z'atar has sumac (dark red in color), sesame seeds, and thyme...so good on goat and lamb!
Here's some background and some links for the vaduvan:
The Gourmet Magazine article was particularly interesting -- if it's still there. (Small tear!)