In a wok, or large pan, bring oil to a high temperature.
Fry the onion and white spring onion parts for a minute, remove from the wok and set aside again.
Bring some new oil to high temperature.
Spread the noodles over the wok, making as much contact with the pan as possible.
Fry the noodles hard in the wok for 4 minutes. Some pieces of noodles may turn (golden) brown, this is the intention!
Carefully check that the underside is nicely crisped.
Now carefully turn the noodles over in the wok with two spatulas.
Add some extra oil by going along the edge of the wok.
Let the noodles fry for another 4 minutes.
Add the bean sprouts to the wok and slide under the noodles for 60 seconds.
Add the onion, white spring onion pieces, green spring onion and sauce to the wok.
Fry everything on high heat for another 1 minute.
Add the sesame oil.
Serve and eat immediately, so the fried noodles are still nice and crispy.