In a large bowl, mix together the drained 2-5 ounce cans Albacore tuna, 1/4 cup plain Greek yogurt, 1/8 cup mayonnaise, minced 1/4 cup red onion, chopped 2 tablespoons fresh parsley, 2 tablespoons fresh dill, 1 tablespoon Dijon mustard, 1 teaspoon lemon juice, Salt and pepper to taste.
Toast the 4 slices of bread and evenly spread the 1 tablespoon salted butter on one side of each slice.
Spoon the tuna salad mixture onto two slices of the bread, spreading it evenly.
Add your desired topping. Top each sandwich with the remaining slices of bread.
Cut the sandwiches in half and serve.
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Notes
Storage: You can make this simple salad and store it in the fridge until ready to eat. Store tuna fish salad in an airtight container in the fridge for up to 4 days.Freezing: I do not recommend freezing prepared tuna salad.