Tip: Fat-free mayonnaise adds sodium, so use unsalted canned tuna to keep the total amount of sodium down. For variety, add cucumber or tomato slices, 1 teaspoon raisins, 1 tablespoon chopped apples or 1/2 teaspoon chopped fresh chives to each sandwich.
2 cans (6 ounces each) unsalted white tuna packed in water, drained
1/2 cup diced celery
1 teaspoon lemon juice
1/3 cup fat-free mayonnaise
4 lettuce leaves
8 slices whole-wheat bread
Put tuna in a small bowl and flake with a fork. Add the celery, lemon juice and mayonnaise and stir well.
To serve, place 1 lettuce leaf on a slice of bread. Top with 1/4 of the tuna mixture and another slice of bread. Repeat to make the other sandwiches. Serve immediately.