Tiamatlady

here's a link (http://www.epicurious.com/cooking/how_to/food_dictionary/entry?id=2823) to its history.

and apparently I mistyped. traditionally, the dressing does not have avocado, but every version I've seen personally uses it.

the "traditional version" consists of mayonnaise, tarragon vinegar, anchovies, parsley, chives, tarragon, scallions and garlic.