Lovely lunch idea, this tuna salad stuffed avocado with cilantro!
Then place the 2 halves back on each other to prevent the avocado from discoloration. Put the avocado aside until needed later on. Add the canned tuna to a medium mixing bowl. Add the diced red onion and a pinch of pepper and salt.
Stir the tuna salad well. Check the seasoning and add extra pepper or salt to taste if necessary. Place the 2 avocado halves next to each other on a clean plate and fill them up with the tuna salad. Serve cold.