Mix the teriyaki sauce

• Combine the soy sauce, mirin, brown sugar, garlic and ginger in a bowl.
• Stir until the sugar dissolves.

Cook the noodles

• Boil the noodles in salted water until tender.
• Drain and set aside.

Sear the beef

• Heat the sesame oil in a frying pan over high heat.
• Add the beef and sear until browned.

Add the sauce

• Pour the teriyaki sauce over the beef.
• Simmer until the sauce thickens and glazes the meat.

Toss and serve

• Add the noodles and toss to coat in the sauce.
• Top with spring onion and sesame seeds.