Slice cucumbers in half. With a small spoon, scoop out the seeds of the cucumber, creating a boat.
Add everything else, except salt, to a medium sized bowl and mix well. Salt to taste, as different tunas and mayos have different salt levels.
Scoop tuna salad into the cucumber boats and serve!
Video
Notes
Our favorite brand of sustainable tuna is Safe Catch.SubstitutionsOnion: Use a yellow or white in place of the red.Dill: Use 1/2 teaspoon of dried dill in place of fresh. Vinegar: Use white in place of apple cider.