Combine the iceberg lettuce, chicory, romaine, and watercress and form a mound in a large shallow salad bowl or deep platter. Arrange the tomatoes, chicken, bacon, avocado, and eggs artfully on top of the greens (long, narrow strips of the individual ingredients is traditional). Add 1 cup (250 ml) of the salad dressing immediately before serving. Serves 6 to 8.