Place quinoa and 3 cups water in a medium saucepan, cover and bring to a boil. Reduce the flame to medium-low and simmer 15 minutes. Remove from flame and let sit for 5 minutes.
While the quinoa is cooking, bring 4 cups of water to a boil, add the shiitake, cover and simmer 20 minutes. Remove shiitake, discard stems and slice caps. (If using Eden Sliced Shiitake, just place in the water without soaking and do not remove.) Place the shiitake back into the boiling water. Add onions and garlic and cook another 5 minutes. Slowly add the dissolved kuzu, stirring constantly to prevent lumping, until thick and translucent. Add the shoyu, reduce flame to low, and simmer 2 to 3 minutes. Serve over quinoa. Garnish with chopped green onions.
Per serving - 216 calories, 4 g fat (15% calories from fat), 9 g protein, 36 g carbohydrate, 14 g fiber, 0 mg cholesterol, 284 mg sodium