Place individual lettuce leaves on a large plate/tray and spoon a desired amount of the salmon into each leaf.
To make the avocado sauce combine all the ingredients and puree until smooth. Place a dollop of the mixture on top of the salmon, sprinkle with chives/spring onions (opional) and serve!
Notes
If you don't have salmon leftovers you can easily prepare the salmon from raw. Simply place your salmon fillet on top of a baking sheet lined with baking paper, season, drizzle with oil (or add a knob of butter), a little lemon juice and bake in a preheated oven for approx. 15 minutes (gas mark 5/ 190 C). Remove from the oven, set aside to cool, then make the lettuce cups.
Use canned salmon if preferred.
Substitutions: If you aren't keen on mint you can use cilantro instead or simply omit the herbs altogether.
Best served immediately.
For a more substantial meal idea place these lettuce wraps along with the salmon and avocado dip inside a corn/wheat tortilla, fold and enjoy.
Storing: The avocado sauce is best served immediately but you can refrigerate it covered for up to an hour.