Heat the cooking oil in a wok.
Add the pork and stir fry until browned. If the pork is unseasoned, add salt and pepper. If already seasoned, skip the salt and pepper.
Add the onion, garlic and ginger. Stir fry for 30 seconds.
Throw in the cabbage and carrot. Stir fry for 10 seconds to coat the vegetables with oil.
Empty the packet of dashi into the wok. Sprinkle in the sugar. Toss.
Pour in the sake and mirin. Stir fry for about a minute or until the mixture is quite dry.
Add the noodles.
Pour in the soy sauce.
Stir fry just until the vegetables are done and the noodles are heated through.
Sprinkle the yakisoba with toasted sesame seeds before serving.