Bring a medium pot of generously salted water to a boil. Add shrimp and cook until pink and cooked through, 1 to 2 minutes. Drain, rinse under cold running water and drain again.
Chop shrimp into 1/2-inch pieces and transfer to a large bowl. Add onion, lime juice, cilantro, mango, tomato, jalapeño and salt and toss well. Cover and chill until cold, about 1 hour. Yield: 6 to 8 servings.
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