Lay out the greens and all the fixings in small dishes.
Have a big stainless bowl with tongs. Have everyone build their own salad by throwing what they want into the bowl. Toss and tip the salad onto a cutting board. With 2 knives, quickly chop the salad so that it's chopped into smaller pieces. Throw it back into the metal dish and toss with Herby Ranch Dressing.
Transfer to a plate and sprinkle with a little salt and pepper.
Herby Ranch Dressing:
Combine the mayonnaise, buttermilk, sour cream, parsley, chives, oregano, vinegar, Worcestershire sauce and salt and pepper to taste in a bowl. Chill for a couple of hours before serving.