In a medium size bowl mix together the Shaoxing wine, vinegar, half a cup of soy sauce, two tablespoons of cornstarch, one tablespoon of brown sugar, salt and pepper. Mix to combine then add in the sliced steak and toss to coat. Leave to marinate for 30 minutes.
In a small bowl mix together the minced ginger and the white parts of the sliced scallions
In a jug whisk together the beef broth, oyster sauce, final 0.25 cup of soy and remaining tablespoon of cornstarch and tablespoon of brown sugar.
Line all bowls and jugs next to the stive to have on hand when starting to cook.
Add a tablespoon of oil to a large skillet and add in half the beef so as not to crowd the pan. Cook for a minute or two on one side then turn and do the same until slightly charred on the second side. Remove from the pan and set aside on a plate. Repeat the process again to fry the remaining beef starting with adding a little more oil to the skillet. Remove from the pan and set aside.
Tip away any excess sauce in the pan but do not wipe clean. Add another tablespoon of oil to the pan and add in the ginger and sliced scallions. Cook for a few minutes until fragrant then add in the broccoli. Toss to coat and cook for 3 to 4 minutes. Add in the sauce then cover the skillet with a lid. Allow to cook for 3 to 5 minutes until the broccoli is starting to soften then remove the lid and add in the cooked beef.
Toss to coat and allow to warm through for 3 to 4 minutes.
To serve, lay a base of white rice in a bowl, spoon over the beef and broccoli. Sprinkle over the green parts of the sliced scallions and finish with some toasted sesame seeds.