Cut chicken into bite size pieces. In a medium bowl, combine the sugar, soy sauce and mirin wine or stock. Mix well, and set aside.
In a large frying pan, heat oil over medium high heat. Squeeze juice from grated ginger into pan, then add grated ginger and stir-fry until brown. Increase heat to high, and stir in chicken. Season with soy sauce mixture, and cook for 2 more minutes.
One at a time add the carrots, onions, bamboo shoots, mushrooms and watercress. Stir after each addition. Add rice noodles; cook, stirring, for about 3 more minutes, or until done.