Put the pieces of lamb in a large, heavy 7-qt. Dutch oven. Sprinkle with salt and pepper and add the garlic, rosemary, barley, onions, celery and water. Bring to a boil over medium-high heat, lower heat and simmer, covered for 1 hour. Add the potatoes, turnips, carrots, and yams, and cook for 20 minutes more. Add the green beans and chick-peas and cook for 10 minutes. Add the peas and cook for 5 minutes more. Remove from heat and stir in lemon juice and lemon peel. Taste for seasoning, and transfer to a warmed serving dish. Sprinkle with parsley and serve.