Cook noodles in salted boiling water until al dente. Drain and set aside.
Heat sesame oil in a skillet. Cook onion, garlic, and ginger until fragrant.
Add ground pork and cook until browned.
Stir in mushrooms, miso paste, soy sauce, mirin, sugar, and pepper. Cook 5–7 minutes until thick.
In a bowl mix ricotta, egg, parmesan, miso paste, and salt.
Preheat oven to 375°F (190°C).
Spread a thin layer of pork sauce in a baking dish.
Add noodles, ricotta mixture, mozzarella, and pork sauce.
Repeat layers until full.
Top with mozzarella, parmesan, and optional panko.
Bake covered 25 minutes, then uncovered 15 minutes.
Rest for 10 minutes before serving.