Tear lettuce leaves into bite-size pieces to make about 4 cups and add green onions slices.
In a small bowl, whisk the dressing ingredients and refrigerate.
Just before serving, pour dressing over lettuce and toss, or serve on the side if you prefer. Refrigerate leftovers.
FOR VARIATION: you can also make the dressing for this salad, mixing 1/4 cup buttermilk, 1 or 2 tablespoons salad dressing or mayo and 1 or 2 tablespoons sugar, (according to your taste), 2 tablespoons apple cider vinegar, salt and pepper, and serve with 6 cups torn leaf lettuce washed and dried. Refrigerate leftovers.