1) Place all the ingredients into refrigerator to chill down.
2) In a large bowl, combine beans, jicama, peas, pimiento, chicken and bananas. Mix together.
3) In a cup, stir in orange juice, oil, cilantro and green onion.
4) Pour this mixture over the bean mixture. Toss gently by adding seasonings.
5) Use a serving dish, to line with lettuce leaves. Heap the bean mixture and serve immediately.