Heat oil in a saucepan over medium heat and crumble in ground beef, cooking until it just starts to brown.
Stir in grated ginger and soy sauce, cooking for about 10 to 15 seconds to develop flavor.
Pour in 1 cup of water and sprinkle white pepper powder, then cover and let it simmer for 10 minutes, adding water if it reduces too much.
Cook the vermicelli noodles in boiling salted water until just tender, then drain and set aside.
Combine corn flour with half a cup of water, then stir the mixture into the beef sauce until it thickens evenly.
Add the cooked noodles to the sauce, gently toss to coat, and serve topped with chopped spring onions.
Optionally drizzle Chinese dark vinegar and chilli oil over the top to adjust flavor as desired.