Open the can of salmon and drain the liquid.
In a bowl, flake the salmon with a fork.
Add mayonnaise, Dijon mustard, and lemon juice to the salmon.
Mix in the chopped celery and red onion.
Stir in the fresh dill or parsley.
Season with salt and pepper to taste.
If desired, add diced cucumber and avocado.
Serve the mixture on lettuce leaves.
Optionally, chill in the refrigerator for 30 minutes.
Enjoy your delicious canned salmon dish!