Season ground pork with soy sauce and mirin.
Heat oil in a pan and sauté chopped garlic and green onions.
Add the seasoned ground pork and stir-fry.
Boil udon noodles for 2 minutes, then drain.
Place the udon noodles in a bowl, and top with seaweed flakes, chopped green onions, and an egg yolk.
Add the cooked pork, drizzle with soy sauce and sesame oil.
Mix well before eating.