Cube the seitan and pulse in a food processor or blender until the consistency of ground beef. Heat the oil in a medium skillet and sauté the onions and garlic for 2 to 3 minutes. Chop the shiitake and add to the skillet with the green peppers. Sauté another 2 to 3 minutes. Add the spaghetti sauce and barley malt or maple syrup. Cover, reduce the flame and simmer for 10 to 55 minutes. Fill the buns with the hot sauce mixture and serve.
Per serving - 487 calories, 9 gram fat (15% calories from fat), 19 gram protein, 94 gram carbohydrate, 12 gram fiber, 0 milligram cholesterol, 372 milligram sodium