How to Make a Tuna Melt

By Chef John

4.86 / 5

15min

10min

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