Cut the seitan and the veggies into strips. Set aside.
Mix all the marinade ingredients in a bowl until well combined. Add the seitan and mix with a spoon or using your hands. Cover the bowl (I used a dishcloth) and let stand for 1 to 2 hours in the fridge.
Preheat the oven to 355ºF or 180ºC.
Place the seitan onto a baking tray with some parchment paper and bake for 25 minutes or until golden brown. Stir every 10 minutes.
Heat the pita bread using the oven, a skillet or a toaster (optional) and fill it with the seitan, veggies and some yogurt sauce to taste.
Nutritional information has been calculated using whole wheat pita bread and not including Vegan yogurt sauce.