First, make the sauce. Using a fork, whisk together all the ingredients for the sauce in a small bowl, then set aside. Heat a large skillet over medium heat, and add the sesame oil. When hot, add the green onion, ginger, and garlic and cook for about 2 minutes until the white parts of the onion are slightly softened. Add the spiralized zucchini and a pinch of salt, then cook, stirring constantly, until wilted, about 3 to 4 minutes. Pour in the sauce and continue to cook for another minute or so, until the sauce thickens and nicely coats the noodles. Stir in the peanuts, reserving approximately 1 tablespoon for garnish. Transfer to a serving dish, garnish with the reserved peanuts and serve immediately.