- Prepare the tuna mixture: In a medium bowl, combine the drained tuna, mayonnaise, Dijon mustard, chopped red onion, chopped celery, and sweet relish. Mix everything together until fully combined. Season with salt and pepper to taste.
- Toast the bread: Lightly toast your bread of choice in a pan or toaster. If you want extra flavor, you can grill the bread with a little butter.
- Assemble the sandwich: Spread the tuna mixture evenly on one slice of bread. If you’re adding cheese, place a slice on top of the tuna mixture. Add lettuce and tomato if desired.
- Serve and enjoy: Top with the second slice of bread, cut your sandwich in half, and serve with a side of your favorite soup, like the tomato soup in the picture!
Secret Tip: The sweet relish adds a perfect touch of sweetness and tang that takes your tuna sandwich from ordinary to extraordinary. Try it out—it’s a total game-changer!
