In a small mixing bowl whisk together beef stock, dark soy sauce, oyster sauce, vinegar, sugar and cornstarch/cornflour. Place to one side and whisk again just before needed.
In a large pan over high heat add 1 tbsp sesame oil. Once smoking hot, add in the steak strips and fry for a minute or so each side until browned and nearly cooked through the centre. Remove and leave any excess oil behind. Lower heat to medium.
Add a drizzle of vegetable oil if needed, then add in broccoli and onion. Fry until the onion softens and turns golden and the broccoli lightly chars and softens ever so slightly (it will properly cook through in the next step).
Push everything to the outside of the pan and into the centre add ginger, garlic and black pepper. Fry for a couple of mins then incorporate everything together. Pour in sauce (remember to whisk again beforehand), then reduce to a simmer for around 7-10mins until it thickens.
Stir in beef then toss in the noodles. If the sauce is still slightly thin then gently toss and simmer until it thickens. If you over-thicken, just toss through a splash of stock or water.
Serve up with sesame seeds and spring onion. Enjoy!
