I followed the recipe from Enjoying Healthy Foods but without the pepper and worstershire. Feel free to add whatever veggies you like. In addition to the recipe I added zucchini and cabbage. It was a huge hit - especially with the birthday girl.
The best compliment I got was from her 6 and 3/4 year-old sister, Hero. She said, "This is the best Japanese food I've ever had".
Try it and let me know what you think.