Peel six tomatoes, remove thin slices from top of each, and take out seeds and pulp. Sprinkle inside with salt, invert, and let stand one-half hour. Place seeds and pulp removed from tomatoes in a strainer to drain. Mix one-third cup cucumbers cut in dice, one-third cup cold cooked peas, one-fourth cup pickles finely chopped, one-third cup tomato pulp, and two tablespoons capers. Season with salt, pepper, and vinegar. Put in a cheese-cloth and squeeze; then add one-half cup cold cooked chicken cut in very small dice. Mix with Mayonnaise Dressing, refill tomatoes, sprinkle with finely chopped parsley, and place each on a lettuce leaf.