Remove large claws and split a lobster in two lengthwise by beginning the cut on inside of tail end and cutting through entire length of tail and body. Open lobster, remove tail meat, liver, and coral, and set aside. Discard intestinal vein, stomach, and fat, and wipe inside thoroughly with cloth wrung out of cold water. Body meat and small claws are left on shell. Remove meat from upper parts of large claws and cut off (using scissors or can opener) one-half the shell from lowers parts, taking out meat and leaving the parts in suitable condition to refill. Cut lobster meat in one-half inch cubes and mix with an equal quantity of finely cut celery. Season with salt, pepper, and vinegar, and moisten with Mayonnaise Dressing. Refill tail, body, and under half of large claw shells. Mix liver and coral, rob through a sieve, add one tablespoon Mayonnaise Dressing and a few drops anchovy sauce with enough more Mayonnaise Dressing to cover lobster already in shell. Arrange on a bed of lettuce leaves.