Cut the avocados in half and remove the pits. Scoop out some of the avocado flesh to create a larger cavity for the tuna filling.
In a mixing bowl, combine the drained tuna, mayonnaise, red onion, celery, lemon juice, salt, and pepper. Mix well to combine.
Taste the tuna mixture and adjust seasoning as needed.
Spoon the tuna mixture into the avocado halves, dividing it evenly among them.
Top each stuffed avocado with your choice of optional toppings, such as chopped parsley, a sprinkle of paprika, or a drizzle of hot sauce.
Serve the stuffed tuna avocados immediately as a light meal or snack.
Enjoy!
