How to Make a Tuna Melt

Ingredients (13)

• + 1 (6.5 ounce) jar oil-packed tuna, drained add to pantry
• + 1 tablespoon minced green onion add to pantry
• + 2 tablespoons finely diced celery add to pantry
• ✓ 2 teaspoons capers, drained
• + 1 teaspoon Asian chile paste (such as sambal oelek) add to pantry
• ✓ 2 tablespoons mayonnaise, or more to taste
• + ⅓ cup fresh mozzarella cheese add to pantry
• + salt and ground black pepper to taste add to pantry
• ✓ salt and ground black pepper to taste
• + 2 tablespoons softened butter, divided add to pantry
• + 2 thick slices French bread add to pantry
• + ¼ cup shredded sharp white Cheddar cheese, divided add to pantry
• + 1 pinch cayenne pepper, or to taste add to pantry