Toss together the chicken, celery, scallions, dill and parsley in a large bowl.
In a small bowl, whisk together the mayonnaise, lemon juice, mustard, salt and pepper to taste. Add to the chicken and mix gently until combined. Refrigerate until ready to serve.
POACHED CHICKEN FOR SALADS:
Yield:4 cups cubed chicken or 4 to 6 servings
Put the parsley, thyme, onion, carrot, celery, and chicken breasts in a medium saucepan. Cover with the broth, and bring just to a boil. Lower the heat to very low and cover. Poach the chicken until firm to the touch, about 20 minutes. Remove the pan from the heat, uncover and cool the chicken in the liquid for 30 minutes.
Transfer the chicken to a cutting board and reserve the liquid. Bone and skin the chicken and roughly chop the meat into about 1-inch pieces. Discard the bones and skin.
Strain the broth and store, covered, in the refrigerator for 3 days or freeze for later use. Remove any fat from the surface of the broth before using.
Serve on a bed of lettuce with sliced tomatoes, in half an avocado or in a chicken club sandwich made with artisanal bread, crispy smoked bacon, vine-ripened tomatoes and lettuce.
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