Noodle sauce: combine the Chinese cooking wine, oyster sauce, brown sugar, light soy sauce and dark soy sauce in a glass jug and use a mini whisk to whisk together, then set aside.
Cooked beef: place a large saute pan on the stove, turn the heat to high, add the peanut oil, beef mince, salt, pepper, garlic and ginger. Cook till browned and use a wooden spoon to break up any clumps of meat as you go. It will take 5 to 8 minutes. Once cooked, transfer to a bowl lined with 2 sheets of paper towel.
Cook vegetables: without rinsing or cleaning the pan, add the broccoli, capsicum, onion and green onion. Cook these for 3-4 minutes, stirring as you go. They will have a wet, sweaty look when cooked.
Cook noodles: read and follow the instructions on the noodle packet to cook them. Drain using a colander over the sink.
Combine: next add the cooked beef back to the pan with the vegetables, transfer in the noodles and then pour the Mongolian sauce over the top. Use kitchen tongs to toss and combine the sauce, beef, vegetables and noodles. Then allow the dish to heat through.
Serve: grab some bowls and chopsticks, portion into bowls and dive on in!