Cut the beef into bite-sized pieces.
Slice the onion and green onion thinly.
Soak the glass noodles in lukewarm water.
Heat oil in a pan and stir-fry the beef.
Add the sliced onion and green onion, and stir-fry together.
Add the soaked glass noodles, soy sauce, and sugar, and stir-fry until the seasoning is absorbed.
Finish by adding sesame oil and roasted sesame seeds.