Combine and mix all sauce ingredients and set aside.
In a skillet over medium heat with a tablespoon of oil, saute the seitan for 5 minutes, until seitan is slightly browned on all sides.
Transfer to a plate, and cover to keep warm.
In the same skillet, add another spoon of oil, and saute the shallots for 3 minutes.
Add the peppers and cook for 4 minutes or until medium-soft.
Add ginger, garlic, and chili flakes pepper, and cook about 2 minutes more.
Pour the sauce into the pan and mix everything.
After a few minutes, when the content starts to thicken, add the seitan. Let cook another 2 minutes.
Serve warm with cooked rice.

2 tablespoon oil
2 seitan fillet, sliced into strips
3 shallots, finely chopped
1/2 red pepper, thinly sliced
1/2 green pepper, thinly sliced
2 tablespoon grated ginger
3 gloves garlic, crushed
1/2 tablespoon chili flakes
2 cup cooked rice to accompany

Sauce
1 orange, juice of
1/2 orange, scratches of the peel
3 tablespoon soy sauce
2 tablespoon mirin (rice vinegar)
1 tablespoon flour