Seitan stir fry

Before being vegan I used to make some of my stir fries with meat. Obviously, I won't ever think of that thing again. So I tried to make it with seitan. And guess what? It works really well.
And it's even quicker that before, because there isn't any meat to cook. And it's cruelty free too :)
Let's get to the recipe.

Ingredients:

300 g (4 cups) chopped mushrooms

200 g (2 cups) chopped peppers

150 g onions (1 large onion)

200 g (3 cups) chinese cabbage, shredded

170 g (6 oz) seitan, cut into bite size pieces