INGREDIENTS
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2 lemons
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4 (1-inch-thick) watermelon slices, rind removed
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Kosher salt
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Freshly ground pepper
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1 tablespoon finely chopped sweet onion
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3 tablespoons mayonnaise
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2 tablespoons finely chopped celery
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1 pound peeled and deveined, large cooked shrimp
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2 tablespoons chopped fresh tarragon
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1 (5-oz.) package baby arugula