INGREDIENTS
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4 cans (5 ounces each) solid white tuna packed in water, drained
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1/3 cup mayonnaise, plus more for spreading
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1/4 cup finely chopped red onion
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4 teaspoons capers, drained
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1 Tablespoon fresh lemon juice
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1/2 teaspoon coarse salt
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1 teaspoon ground pepper
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1/4 teaspoon dried oregano leaves
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6 slices crusty bread
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10 thin slices tomato
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6 slices provolone