If you make this salad a day ahead, add 1 extra chopped tomato just before serving. Oil-cured ripe black olives are sold on the pickle aisle.
Break feta cheese into small pieces. Do not crumble.
Stir together dressing and parsley. Stir in feta and remaining ingredients. Cover and chill at least 1 hour or up to 2 days. Serve with a slotted spoon.
Tomato-Feta Lettuce Salad: Tear 1 small head iceberg lettuce and 1 small head romaine lettuce into bite-size pieces; toss together. Arrange lettuces evenly on 4 individual plates, and top evenly with chilled tomato mixture (do not use slotted spoon). Serve immediately.
For testing purposes only, we used Ken's Steak House Greek dressing.