Toss beef with cornflour, sesame oil and Chinese wine then set aside to marinate.
In a large wok heat 2 tablespoons oil until smoking hot. Add the hor fun and stir fry until golden brown, about 2 to 3 minutes.
Add the dark soy sauce and stir fry for another 2 minutes to evenly colour. Turn onto a serving platter.
In the same wok heat the 1 tablespoon oil over high heat until it shimmers. Add the garlic and beef and stir and cook for 1 minute. It's ok if the meat is still pink.
Add the water. Stir in the soy sauce, Chinese wine, sesame oil, oyster sauce and sugar then mix well. Bring to a boil.
In a small bowl combine the cornflour with 2 tablespoons water and mix into a slurry. Pour in the cornflour slurry in to thicken the gravy stirring constantly.
Pour the gravy over the noodles and sprinkle with white pepper. Serve immediately.