Tuna Melts | America's Test Kitchen

Ingredients

• 2 (5-ounce) cans solid white tuna in water, drained and flaked
• 1/4 cups mayonnaise
• 1/4 cup finely chopped onion
• 1/4 cup chopped bread-and-butter pickles
• 1/4 cup minced celery
• 1 tablespoon Dijon mustard
• 2 teaspoons lemon juice
• 1/2 teaspoon pepper
• 1/8 teaspoon table salt
• 8 slices hearty white sandwich bread
• 6 tablespoons unsalted butter , melted
• 4 slices deli sharp cheddar cheese (4 ounces)
• 4 slices deli American cheese (4 ounces)