Heat the butter over medium heat in a skillet that has a lid. Add the pasta and toast until deep golden and nutty. Add the leeks and wilt, 3 to 4 minutes. Season with salt and pepper, and add wine, if using, and cook until it evaporates. Add the rice and the chicken stock and lemon zest. Bring to a boil, and reduce the heat to a simmer. Cover and cook until almost tender, 15 minutes. Add the chicken, lemon juice and parsley. Cover, let stand 5 to 10 minutes, then serve.
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Place the cleaned chicken in a pot on bed of bay leaves, carrots, garlic, lemon, onions, celery and parsley. Fill the pot covering the top of the chicken with about 12 cups water. Sprinkle with salt and throw in a couple of peppercorns. Bring the water to a low boil then gently cook at low rolling simmer for about 1 hour, turning the chicken occasionally. Turn off the heat and allow the chicken to cool completely in its own juices. Remove the chicken and separate the meat from the skin and bones. Strain and reserve all of the cooking liquids.