Quick Beef in Black Bean Sauce

1. Prepare the Steak:
   Start by removing the thick layer of fat from the sides of the steaks and discard it. Slice the steak into long strips, about 1cm thick. Place the strips in a bowl and toss them with the cornflour and a pinch of salt and pepper for seasoning. This will help to tenderize the beef and create a nice crust when cooked.

2. Heat the Pan:
   In a large frying pan or wok, heat the sesame oil over high heat until it’s hot and shimmering. This ensures a good sear on the meat.

3. Cook the Beef:
   Carefully add the seasoned steak strips to the hot oil. Fry them for about 3-5 minutes, stirring occasionally, until they are golden brown on the outside. Use a slotted spoon to remove the beef from the pan and transfer it to a plate. This keeps the beef juicy and prevents overcooking.

4. Sauté the Vegetables:
   In the same pan, add the sliced onion and peppers. Stir-fry for 6-7 minutes until they begin to soften and become slightly translucent. This will enhance their sweetness and flavor.

5. Add Aromatics:
   Stir in the crushed garlic, grated ginger, and finely chopped chili. Cook everything together for an additional minute, stirring continuously to release their aromatic flavors.

6. Combine Ingredients:
   Return the browned beef to the pan. Pour in the black bean sauce, rice wine vinegar, sugar, and 2 tablespoons of water to loosen the mixture slightly. Stir everything together until well combined. Allow it to simmer for a couple of minutes, letting the flavors meld.

7. Serve:
   Once everything is heated through and well mixed, remove the pan from the heat. Serve the stir-fry in deep bowls alongside mounds of sticky rice. If desired, top with fresh coriander leaves for an extra burst of flavor.

Enjoy your delicious Quick Beef in Black Bean Sauce!