Heat a large pot on medium heat and sauté onion, garlic, and ginger until cooked through. Add vegetable stock, spices, soy sauce, and vegetables. Meanwhile, drain and rinse shirataki noodles. Pat dry and separate with your fingers as you add them to the pot. Stir mixture so all ingredients are evenly distributed. Bring soup to a boil, reduce heat, and simmer until all vegetables are cooked through. Serve with more chopped green onions on top, if you desire!