1. Soak the mung bean vermicelli in hot water for 10 minutes. Drain and drizzle in a little sesame oil to keep the noodles from sticking together. If you are using the sweet potato noodles, cook them according the package directions, then proceed the same way.
2. In a large pan or wok over medium heat, heat coconut or olive oil and 1 tablespoon of the sesame oil.
3. Add onion and garlic and sauté for 1-2 minutes.
4. Add the spinach, carrots, scallions, mushrooms, zucchini, and tempeh and cook for 4-5 minutes, until the vegetables are softened and the tempeh is cooked through.
5. Turn heat to low and add cellophane noodles, cilantro, tamari, sugar, and the rest of the sesame oil.
6. Mix to combine and stir-fry for another minute or two.
7. Taste and adjust seasonings. Add sesame seeds and sriracha to taste before serving.