1 can (5 oz / 140 g) tuna in water or oil, drained
3 tbsp mayonnaise (or Greek yogurt for a lighter version)
1 tbsp Dijon mustard (optional, for tang)
1 tbsp lemon juice (freshly squeezed)
1 small celery stalk, finely chopped
2 tbsp red onion, finely chopped
Salt and freshly ground black pepper, to taste
For the Sandwich:
4 slices whole-grain or white sandwich bread (toasted, optional)
4 leaves crisp lettuce (romaine, iceberg, or butter lettuce)
4 tomato slices (ripe, firm, and fresh)
Butter (optional, for spreading on toast)
Optional Add-ons:
Pickles or cucumber slices
Cheese (Swiss, cheddar, or provolone)
Avocado slices
Sprouts for crunch
Instructions
Prepare the tuna salad: In a mixing bowl, combine tuna, mayonnaise, mustard, lemon juice, celery, and onion. Mix until creamy and well blended. Season with salt and pepper.
Toast the bread (optional): Lightly toast the bread slices for extra crunch and to prevent sogginess.
Assemble the sandwich: Lay a lettuce leaf on one slice of bread, spoon tuna salad on top, add tomato slices, and cover with the second bread slice.
Serve immediately: Slice diagonally and serve with chips, salad, or soup.