Prepare couscous according to package directions adding 1 tablespoon of the olive oil and omitting salt. Let stand 5 minutes and fluff with fork.

Transfer to medium mixing bowl. Add mango, tomato, onion, cilantro and jalapeño.

Wisk together lime juice, remaining 2 tablespoons oil, salt and pepper. Pour over couscous; toss to blend.

Chill and serve.