Thanks Ellen, I was just going to ask the same thing! I would love to make my own sauce... Hiroyuki, thanks for pointing me to that thread, I didn't find it when I did a search!
I have recently tried a couple of recipes for yakisoba. While the results were ok, they just didn't taste right. Does anyone have an authentic tasting recipe? I'm guessing my problem is a combination of the right sauce recipe and the right ratio of ingredients.