Kula...
"Ranch Dressing" is a salad dressing whose flavor is based upon buttermilk and herbs. (yeah, a gringo thing, probably).
You might look around the grocer's "import section" for something called "Hidden Valley Ranch dressing".
Failing that, I goobled and found a couple places with "clone recipes" for the stuff. One at:
http://www.recipezaar.com/Hidden-Val...ng-Clone-24178
Another at:
http://www.cdkitchen.com/recipes/rec...ing54867.shtml
Also makes a dandy thing fere dippin' yer chips in, but not your biscuits. And has been known to improve the flavor of just about anything. Except haggis, of course.
Enjoy!