Mix together the ginger, rice wine vinegar, sesame oil, soy sauce, and garlic. Pour over pork and let stand for at least 10 minutes.
While the pork is marinating, mix together the remaining soy sauce, rice wine vinegar, white miso, and brown sugar. Set aside.
Heat the oil in a large frying pan over medium to medium-high heat. Add pork in a single layer and sear. Flip the pork and cook until no longer pink and then add the seasoning sauce.
Flip the pork to make sure the seasoning has coated both sides.
Serve immediately.