*Optional* In a mixing bowl, marinade meat with 1.5 tbsp soy sauce, 1 tbsp sugar, and 2 tsp sesame oil. Set aside.
In a large pot, boil the noodles according to the directions on the package
Drain the noodles and place them in a large mixing bowl, DO NOT rinse them with water.
Using a pair of kitchen scissors, cut the noodles several times in different areas.
Pour in about 1 - 2 tbsp of sesame oil with the noodles and toss well to coat. Set aside.
In a frying pan, cook the carrots with a bit of sesame oil and season lightly with salt and pepper. Cook until softened with a slight crisp, then remove from heat.
Continue the above step with the onions and cook until desired doneness, then remove from heat.
Continue the above step with the leeks and cook until desired doneness, then remove from heat.
Continue the above step with the mushrooms and cook until desired doneness, then remove from heat.
Cook the meat until completely cooked through and remove from the pan. If you are using unmarinaded meat, season with salt and pepper.
Heat the pan over med-high heat and cook the garlic in a bit of sesame oil for about a minute. Add in the (Noodle Sauce) ingredients and cook for another minute.
Add in the noodles and stir well to combine. Cook until the noodles take on a light-brown hue from the sauce.
Add in the vegetables and mix well to combine, followed the meat. Cook until everything is heated through.
Plate, garnish with sliced green onions, and serve immediately.