Marinate the pork: In a mixing bowl, whisk soy sauce, rice vinegar, honey, sesame oil, ginger, garlic, and black pepper.
Coat and chill: Place pork in the marinade, ensuring it’s well coated. Cover and refrigerate for at least 30 minutes.
Preheat oven: Set your oven to 375°F (190°C) if baking.
Sear the pork (optional): Heat a skillet over medium-high heat, add sesame oil, and sear the pork for 3 minutes per side.
Cook: Transfer the pork to a baking dish and bake for 25 minutes or until the internal temperature reaches 145°F (63°C).
Rest and slice: Let the pork rest for 5 minutes to retain juices. Slice into medallions.
Garnish and serve: Sprinkle with green onions and sesame seeds before serving.