The BEST Tuna Melt: How to Make a Tuna Dream Sandwich!

Ingredients

• 2 (5-ounce) cans tuna in water, drained (280g total)
• 1/4 cup mayonnaise (60ml)
• 1/4 cup finely chopped celery (30g)
• 2 tablespoons finely chopped red onion (15g)
• 1 tablespoon fresh lemon juice (15ml)
• 1 tablespoon chopped fresh dill (5g)
• 1/4 teaspoon black pepper (1g)
• Pinch of salt
• 4 slices sourdough bread
• 4 slices cheddar cheese
• 2 tablespoons butter, softened (30g)