Wash apple and cut into thin rounds, then core (so you have apple rings)
Cut one side of a ripe avocado and peel.
Layer apple, salmon and avocado, starting with apple and finishing with salmon (use only big middle rings)
Coarsely chop walnuts and sprinkle over dish.
Coarsely chop coriander leaves and sprinkle over dish.
Add dijon mustard, honey, balsamic vinegar and olive oil to a sealable container (e.g. mason jar), seal and shake vigorously until vinaigrette is well mixed. Take a spoon and pour over dish with spoon.