Measure all ingredients into a small bowl and whisk together.
Cover and refrigerate at least one hour before serving to allow flavors to develop.
Note: If fresh herbs are available, substitute them, finely chopped, for the dried herbs. Use double the amount of fresh as dry. If the dressing seems too thick when ready to serve, thin with a few tablespoons of additional buttermilk. The recipe may be doubled or tripled as needed.