Leaf lettuce Bring water to a boil; add shrimp, and cook 3 to 5 minutes or until shrimp turn pink. Drain well; rinse with cold water. Chill. Peel and devein shrimp. Break vermicelli into 3-inch pieces. Cook according to directions; drain. Place in a large bowl. Stir in shrimp, green onions, and next 6 ingredients; set aside. Combine sour cream and next 6 ingredients. Pour over shrimp mixture; toss gently. Cover and chill. Transfer in a lettuce-lined platter.