Cook the noodles: In a large pot, bring salted water to a boil and add 1 lb yakisoba or linguine noodles. Cook according to the package instructions until al dente. Drain the noodles and set them aside.
Sauté garlic and ginger: In a large wok or skillet, melt 3 tbsp butter over medium-high heat. Once melted, add 1 tbsp minced garlic and 1 tsp minced ginger. Sauté for about 1-2 minutes until fragrant but not browned.
Prepare the sauce: While the garlic and ginger are cooking, in a separate bowl, mix together 3 tbsp soy sauce, 1 tbsp teriyaki sauce, 1 tbsp mirin (or rice vinegar), and 2 tbsp brown sugar. Stir until the sugar is dissolved.
Add sauce to the wok: Pour the sauce mixture into the wok with the garlic and ginger. Allow it to simmer for 3-4 minutes, stirring occasionally, so the flavors meld together.
Toss in noodles: Add the drained noodles to the wok, tossing them gently in the sauce to ensure they are well coated. Season with salt & pepper to taste.
Finish with sesame oil: Drizzle 1 tbsp sesame oil over the noodles along with 1 tbsp sesame seeds. Toss again to combine and cook for another minute to heat through.
Garnish and serve: Remove from heat and serve the noodles hot, garnished with 2 chopped green onions. Enjoy!