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, raisins, chopped apples or fresh chives to each sandwich.
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.
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