Prep: 15 minutes. Instead of tuna, you can use a 10-ounce can of chunk white chicken in water.
Combine first 3 ingredients in a medium bowl. Stir well. Stir in tuna, water chestnuts, carrots, celery, and pepper.
Spoon 3/4 cup tuna mixture onto each of 4 bread slices. Top with remaining bread slices.
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