Heat 4 T sesame oil, add the garlic, and sauté for 30 seconds. Add the veggies and sauté until almost tender, 3-5 minutes.
Stir in water, miso, vinegar, ginger, sugar, and pepper and bring to a simmer. If the sauce is too thin, dissolve a T of arrowroot or cornstarch in a small amount of water and stir that in as well, then simmer for a minute or two until thickened.
Add the seitan and cashews and heat through.
Spoon over rice or another favorite grain, garnish, and serve hot.
*Bell peppers, broccoli, carrots, cauliflower, green beans, snow peas…