Interesting thread! ^
Without a shadow of a doubt - especially for all you lucky people living stateside - the best salad dressing I have EVER tasted anywhere in the world is:
Olive Garden House Salad Dressing. It hasn't changed for years which is a good thing. It is absolutely fabulous! Especially as they do bottles to take away.....mmmmmmm

You would have to be mad when you dine there and they ask "Soup or Salad" to go for the Soup. Salad everytime.

^