Soak the sotanghon noodles in water for 30 minutes.
Marinate the beef with soy sauce, sesame oil, sugar, mirin and grated garlic for 30 minutes. Set aside.
Blanch the spinach in boiling water with a pinch of salt for 1 minutes. Remove from the pan and transfer in cold water. Squeeze the spinach and set aside.
Pre-heat pan with 1 tbsp. oil. Stir-fry the marinated beef till golden brown and set aside.
Fry 2 large eggs in 1 tbsp. Oil like a pancake. Cut into strips and set aside.
Stir-fry the vegetables in 1 tsp. oil individually with a pinch of salt. Set aside.
Prepare the sauce. Combine all ingredients for the sauce. Mix it well and set aside.
Boil water in a pan with a pinch of salt. Cook the noodles for 5 - 8 minutes. Transfer the noodles in a big bowl.
All all the stir-fried vegetables, beef, egg strips and sauce into the noodles. Mix it well. Ready to serve.