Beef and Broccoli

Name: Beef and Broccoli
Prep time: 5 min
Cook time: 15 min
Total time: 20 min
Cuisine: Chinese
Ingredients: 3 tbsp vegetable oil ((or swap for any other high smoke point flavourless oil)); 500 g (1.1 lbs) skirt/flank steak (sliced very thinly, against the grain *Tip 1); 450 g (1 lb) tenderstem broccoli ((broccolini) any thicker pieces sliced in half length-ways); 1 tsp minced ginger; 2 cloves garlic (minced); 250 ml (1 cup + 2 tsp) hot beef stock ((water + 1 stock cub is fine)); 3 tbsp light soy sauce; 1 tbsp dark soy sauce; 1 tbsp Chinese rice wine (you can swap for sherry if you like); 2 tsp sesame oil; 3 tbsp light brown sugar; 1/8 tsp white pepper; 1/8 tsp black pepper; 2 tbsp cornflour (cornstarch, mixed with 5 tbsp cold water to make a slurry); 1 tsp sesame seeds