This was amazingly tasty and easy to make for a terrific week night meal. I got the recipe from The Vegetarian Starter Guide. In fact the guide is for vegans but this is a tasty sauce that can be adapted to use meat (if you absolutely must). It was too good not to post. Seitan is a meat substitute used in place of chicken or beef. The snow peas go well with the rest of the sauce. I don't eat mushrooms so I left them out.