The Perfect Tuna Melt Irresistible Cheesy Comfort

Ingredients

• 1 (5 ounce / 140g) can tuna in water or oil, drained (flaked if in chunks)
• 2 tablespoons / 30 ml mayonnaise (full-fat or light)
• 1 tablespoon / 15 ml finely chopped celery
• 1 tablespoon / 15 ml finely chopped red onion
• 1 teaspoon / 5 ml lemon juice (freshly squeezed is best!)
• 1/4 teaspoon / 1.25 ml black pepper
• Pinch of salt (to taste)
• 2 slices of bread (sourdough, rye, or your favorite)
• 1 tablespoon / 15g butter, softened
• 2 slices of cheese (cheddar, Swiss, Monterey Jack, or provolone), or more, to taste