In a wok or frying pan, heat oil at medium hight heat. Stir-fry beef until lightly browned. Add carrot and Piman and cook for a minute. Add bean sprouts, noodles, and water. Cover and cook for a couple of minutes. Loosen the noodles, and season with the rest of the ingredients. Stir-fry for a couple of minutes. Sprinkle with Aonori if you like.