Combine the tuna, onion, and celery in a bowl.
In another bowl, combine the parsley, mayonnaise, lemon juice, mustard, tarragon, and pepper.
Pour the second mixture into the tuna mixture and stir to combine.
4 servings
1
* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.