Combine water and salt in a 2 quart saucepan. Bring to boil over medium-high heat. Stir in couscous. Cover. Remove from heat. Let stand for 5 minutes. Fluff couscous lightly with fork. Place in medium mixing bowl. Set aside.

Combine concentrate, vinegar, sugar, oil and peel in 2 cup measure. Blend well with whisk. Add half of juice mixture to couscous. Mix well. Cover and chill at least 1 hour.

Add remaining juice mixture and remaining ingredients to couscous mixture. Toss gently to combine. Line serving bowl with lettuce, if desired.