1. To slice the flank steak it is really important to cut the steak into really thin slices, cutting across the grain of the meat. Prepared like this will ensure a really tender piece of meat.

2. Place the sliced steak into a medium bowl and coat with the cornflour, 1 teaspoon of rice wine, soy sauce, minced garlic, cold water, sesame oil, and season to taste with salt and pepper.

3. In a small bowl, mix the remaining rice wine and hoisin sauce, then set aside.

4. Heat 1 tablespoon of olive oil in a wok over high heat and add the beef in a single layer. Let the beef cook for 1 minute, then stir fry for another 1 minute. Transfer the beef to a plate.

5. Add in the remaining oil, add the garlic, ginger and chili flakes and stir-fry for about 10 seconds. Next add the mushrooms and peppers, season to taste with salt and stir- fry for 2 minutes.

6. Return the beef to the wok, along with the resting juices. Finally, add the hoisin sauce mixture and stir-fry for another 1 minute, until cooked through.

7. Remove from the heat and serve immediately with rice or rice noodles.