- 6 slices white bread
- 2 (5 ounce) cans tuna, drained
- 1/4 cup mayonnaise, or to taste
- 1 tablespoon lemon juice
- 1 tablespoon finely chopped lemon zest
- 1 tablespoon finely chopped fresh dill
- 1 large tomato, thinly sliced
- 6 slices Swiss cheese
- Set oven rack about 6 inches from the heat source and preheat the oven's broiler. Arrange bread in a single layer on a baking sheet.
- Toast bread lightly on both sides in preheated oven, about 1 minute per side.
- Mix tuna, mayonnaise, lemon juice, lemon zest, and dill in a bowl. Spread tuna mixture evenly over each slice of bread. Arrange tomato slices over tuna mixture and top with Swiss cheese.
- Return baking sheet to oven and broil until cheese is melted, 3 to 5 minutes more.