Remove the avocado pit. Scoop out additional flesh of the avocado from where the pit was removed, creating space for the sardines to go. Set aside in a small bowl
In the same bowl, mash together the avocado flesh, sardines, mayonnaise, lemon juice, sea salt, and parsley
Stuff the avocado with the sardine mixture. Serve immediately
Notes
Leftovers: Refrigerate for up to two days
More flavor: Add additional spices, such as cayenne or chili flakes.
No sardines: Use canned tuna or salmon