Bring 2 cups water to a boil in a medium saucepan. Add shrimp; cook 3 minutes or until done. Drain and rinse with cold water; cut shrimp in half. Bring 1 1/4 cups water to a boil in saucepan; gradually stir in couscous. Remove from heat; cover and let stand 5 minutes. Fluff with a fork; cool.
Combine vinegar, vegetable oil, soy sauce, sesame oil, and garlic in a large bowl; stir well with a whisk. Add shrimp, couscous, lettuce, bell pepper, peas, and cilantro; toss well. Sprinkle with peanuts.