According to Houston Press' Robb Walsh, the ranch may have started with cowboys' favorite buttermilk sauce because buttermilk became widely available at the beginning of the last century.
Ranch dressing is basically buttermilk mayonnaise flavored with herbs. Popularized when Clorox found a way to make the Hidden Valley brand shelf stable. (Slate says that bottled ranch dressing can keep for up to 150 days or about five months. A scary thought, right?)
Mix all the ingredients in a bowl and you can adjust the number of ingredients according to your taste.
Cover the sauce with plastic wrap or foil paper before placing it in the fridge and it could be stored in the refrigerator up to 1 week
Serving Size 11
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.