Open the pouches of tuna and use a fork to flake the pieces of fish that stick together. If you're using the canned version, be sure to drain it first.
Dice red onion, boiled egg and celery into small pieces on a cutting board.
In a large mixing bowl, add onion, chopped egg, celery, pickle relish and tuna.
Stir in mayonnaise and dijon mustard. Add a dash of salt and pepper. Mix tuna salad until creamy and spreadable.
Spread tuna on two slices of bread, or add a scoop on top of mixed greens.
Notes
Add more mayo if you like it extra creamy!
Leftovers - store leftovers in an airtight container for up to 3 days in the refrigerator.
Freezing - since this recipe contains mayonnaise, freezing is not recommended because it can curdle when thawed.
Temperature - be careful not to leave this recipe out in the heat. Keep it as cold as possible, preferably on ice, especially at picnics and outdoor events.