Yeah, it’s called Ranch Dressing. And where I live at least (SE Michigan), it’s sometimes called House Dressing for some unknown reason.
What is it?
I mean, we all know how to make your own Thousand Island dressing. Mayonnaise, Ketchup (or Chili Sauce) and Pickle Relish. No? How could I make my own Ranch Dressing? As as long as we’re on the subject, what are those little black specks in it? Weird!
Oh, and I guess I can tell you all, I found the master base for any sauce or dressing. One part Mayonnaise to one part Sour Cream. (One book says dilute it with skim milk if it is too thick. Warning: now I have to tell you, I never tried this.)
And apologies to British, Canadian, etc. dopers who have no idea what these food items are. You should catch on shortly .