Combine first 8 ingredients in container of an electric blender; process until smooth, stopping once to scrape down sides. With blender on high, gradually add oil in a slow, steady stream. Stir in parsley. Cover dressing and chill. Arrange lettuce on chilled salad plates. Top with alternating tomato, cucumber and onion slices. Drizzle with dressing. Yield: 6 servings. |