Cook noodles according to package directions; drain and set aside.

Heat a large sauté pan over medium-high heat and add beef, garlic and ginger.

Cook until meat browns. Drain off fat if using full-fat meat.

Make the sauce: Combine the rest of the ingredients (except for the onions, sesame seeds, cornstarch and water) and add to the meat, stirring to combine. Cook three to five minutes. If the sauce is too watery you can add the cornstarch mixed with water.

Add the sauce to the meat, mix, and bring to a boil. Reduce heat and cook until thickened (two minutes or so). Combine with noodles and garnish with green onions and sesame seeds.