This is a tuna sandwich you would expect from a high-end sandwich shop. It is light, fresh and full of flavor. You must try this!
Whisk together mayonnaise, parsley, chives, tarragon, lemon zest, lemon juice, Dijon mustard, and pepper in a bowl until well combined. Gently stir in the flaked tuna, cover, and refrigerate until chilled, about 30 minutes.
Spread tuna evenly over four of the bread slices. Top with tomatoes, and cheese if using, then top with remaining bread slices.
Per Serving: 485 calories; protein 33.5g; carbohydrates 31.1g; fat 24.7g; cholesterol 51.7mg; sodium 814.5mg.