Ingredients
- 1 cup mayonnaise
- 1/4 cup thinly sliced scallions , plus more for garnish
- 2 tablespoons chopped fresh flat-leaf parsley , plus more for garnish
- Juice of 1 lemon
- 1 teaspoon chopped fresh tarragon
- 1 teaspoon Dijon mustard
- 1/8 teaspoon freshly ground black pepper
- 3 ( 6 - ounce ) cans solid white tuna in oil , drained
- 2 large plum tomatoes ( 1 cup chopped)
- 1 cup ( 4 ounces ) shredded sharp Cheddar cheese
- Toasted rye bread slices , cut into triangles, for serving
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