Step 1: In a large pot, bring generously salted water to a rolling boil. Add your chosen noodles and cook according to the package directions until they are al dente. Drain the cooked noodles and set them aside.
Step 2: Heat the sesame oil in a large skillet or wok over medium-high heat. Add the ground beef and cook, breaking it apart with a spatula, until it's fully browned. This usually takes about 5-7 minutes. Once cooked, drain any excess fat from the skillet.
Step 3: To the browned ground beef, add the minced garlic and ginger. Sauté for 1-2 minutes, stirring constantly, until they become wonderfully fragrant.
Step 4: Pour in the soy sauce and hoisin sauce, then sprinkle in the brown sugar. Stir everything together until well combined and let the sauce simmer for about 2 minutes to allow the flavors to deepen and meld.
Step 5: Add the mixed vegetables to the skillet. Cook for an additional 3-4 minutes, stirring occasionally, until they are tender-crisp.
Step 6: Introduce the cooked noodles to the skillet. Toss everything gently but thoroughly until the noodles are completely coated in the rich, savory sauce.
Step 7: Remove the skillet from the heat. Garnish generously with the chopped green onions and a sprinkle of sesame seeds, if desired, for extra visual appeal and a nutty crunch. Serve your Mongolian Ground Beef Noodles hot and enjoy every last bite!