Did you know that ranch dressing is the number one most popular type of salad dressing sold in America? Overtaking even the omnipresent Italian. According to Robb Walsh of the Houston Press Ranch likely got its start as buttermilk dressing, a cowboy favorite because buttermilk was widely available in the early part of the last century. Ranch dressing is essentially a buttermilk mayonnaise dressing spiffed up with herbs. It was popularized by Clorox, when they figured out a way to make their Hidden Valley brand shelf stable. (According to Slate, the dressing is shelf stable to 150 days or about 5 months. A rather scary thought.) Ranch dressing is very easy to make, especially if you have leftover buttermilk from baking, or making pancakes or soda bread. The base is just buttermilk and mayonnaise. Everything else you essentially just add to taste ? some dry mustard, salt and pepper, a little paprika, herbs like chives, onion greens, parsley and/or dill. Add some crumbled blue cheese, and you have a luscious blue cheese dressing.