While the noodles are cooking, heat the sunflower oil and sesame oil in a large skillet or wok. Add 1/4 cup of water. When hot, add the ginger, soy sauce, and snow peas. Cook over medium-high heat, stirring frequently, until the snow peas are just tender, about 3-4 minutes. Transfer the cooked noodles and their broth to the pan of snow peas. Add the scallions and some black pepper to taste. Cook for 2 minutes more, then lower the heat and stir in the miso. Cook for 1 more minute, and serve.