1. Place cellophane noodles in a large bowl and pour over enough boiling water to cover. Let stand for 10 minutes until soft and transparent. Drain and return to bowl.
2. Using kitchen scissors, cut noodles into two-inch thick pieces. Add chicken (or steak), carrots, scallions and cilantro. Set aside.
3. In a small bowl, whisk together the chicken broth, soy sauce, sesame oil and Chinese mustard. Add mixture to the chicken mixture and toss to combine.
4. Spoon chicken (or steak) mixture into lettuce leaves and roll up.
Serving Suggestion: The filling for the wraps is also great served warm - without the lettuce wrap