Soak the noodles in warm water for 30-45 minutes.
Combine the marinade ingredients. Add the beef and set aside while you prep the other ingredients.
Mix together the sauce ingredients and stir well.
Heat a wok over high heat. Add 1 Tbsp oil.
When the oil is shimmering, add the beef and marinade and cook until the beef loses its red colour, about 2 minutes. If the beef throws some liquid spoon it out. Add a bit more oil. Turn up the heat. Brown your beef. Grey is bad. Brown is good. Go a little longer if you have to. You really want some brown.
Remove beef and wipe out the wok with paper towel. Return the wok to high heat.
Add 2 Tbsp oil. When the oil is shimmering, add the green onion, garlic and red chili and cook about 15-30 seconds. You are going to get some of the smoky flavour from the onions so don't lay off the heat.
Add the noodles and stir until well coated with oil - about 30-45 seconds.
Return the beef to the wok along with the bean sprouts. Stir briefly and add the sauce. Add half the peanuts. Stir to combine and cook, stirring constantly, for one minute.
Add cilantro and stir.
Serve topped with the rest of the peanuts and additional cilantro.