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