Step 1

Slice the beef into strips (against the grain). Mix with the ingredients for the marinade. Leave to rest for 10 minutes.

Step 2

Mix all the ingredients for the sauce then set aside.

Step 3

Heat up the oil in a wok over high heat. Sear the marinated beef until it turns brown (should still be pink inside). Transfer it to a separate plate.

Step 4

Add onion and pepper to the remaining oil in the wok. Cook for a minute or so.

Step 5

Put the beef back into the wok. Stir fry for another 1-2 minutes until the beef is fully cooked.

Step 6

Pour in the sauce. Stir until it becomes thick enough to coat the beef and vegetables nicely.

Step 7

Sprinkle more ground black pepper for more intense flavour (optional). Serve hot with steamed rice.