*** I prepared this dressing for my coworkers for 5 days of Greek salad lunches in our office. I initially prepared with only 3 tablespoons of red wine vinegar. After a quick tasting pow wow, everybody determined that increasing the vinegar would taste more authentic. Hence, the recipe as it's presented herein calls for the full 5. I would encourage tasting as you go after each tablespoon addition of red wine vinegar to suit your personal taste.