Method:
Put tamari, mirin, granulated garlic, onion powder and sesame oil into a wide, shallow dish and stir to combine. Add tempeh, toss to coat, cover and set aside to let marinate for 30 minutes. Meanwhile, toss sweet potatoes with olive oil, ginger, cinnamon and 1 1/2 tablespoons of the marinade from the tempeh. Set the yams aside.
Preheat oven to 350°F.
Heat canola oil in a large skillet over medium heat. Drain tempeh then add and cook, turning frequently, until golden brown, 5 to 7 minutes. Transfer to a 2-quart baking dish, toss with sweet potatoes, salt and pepper then cover with foil and bake until sweet potatoes are tender, 30 to 35 minutes. Garnish with parsley and serve.