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2 (5-oz) can white chunk tuna, drained
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2 eggs, hard-boiled, halved
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2 tablespoon capers
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15 nicoise olives, pitted
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2 tablespoons mayonnaise
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2 teaspoon fine herbs
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Salt and freshly ground black pepper
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4 potato buns
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4 Bibb lettuce leaves
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8 slices Roma tomato
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1/4 red onion , thinly sliced in rings
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