For the chicken, apple, and walnuts 1. * In a large saucepan combine the wine, salt, peppercorns, lemon juice and thyme. Add the chicken breasts and enough water to cover them. 2. * Bring the liquid to a boil, reduce the heat and simmer for 10 minutes. Remove from the heat and let the chicken cool in the liquid. 3. * In a large bowl, mix the sour cream, apples, celery, red onion and parsley together. When the chicken is cool enough to handle, remove it from the liquid. (Discard the liquid.) 4. * Cut the chicken into small pieces, add it to the sour cream mixture and toss. Season to taste with salt and pepper, and stir in the walnuts. Refrigerate until ready to serve.