This fantastically quick stir fry is Vietnamese in origin; bò lúc lắc, or shaking beef, is thought to be named from the rapid cooking style. Beef is marinated in oyster sauce, soy sauces and garlic before being quickly stir fried, and then it is thrown together with onions, peppers and cherry tomatoes; not only is it delicious, but also incredibly quick.
Add the oyster sauce, soy sauces, brown sugar, the diced garlic, white pepper and MSG. Mix to combine.
Cut the beef into 15-20mm (½-¾") chunks, add it to the oyster sauce mix, stir and set aside.
You can either cook this straight away or allow it to marinate for up to 8 hours. I usually try to marinate for 3-4 hours.
Cut the onion into a dice, a similar size to the beef.
Cut the green pepper into the same sized dice as the onion.
Cut the cherry tomatoes in half.
Finely slice the remaining three garlic cloves.
Finely slice the cucumber.
Separate out the lettuce leaves.
Heat a wok over a very high heat and when it is smoking hot, add 2 tablespoons of the cooking oil, followed by the beef and stir fry for 1½-2 minutes, then remove and set aside. Keep as much oil as possible in the wok.
Remove the beef from the marinade (reserving the marinade) whilst the wok is heating up.
Add the remaining tablespoon of oil to the wok, and add the onion, green pepper, sliced garlic and cherry tomatoes, then stir fry for 2 minutes.
Return the beef and the reserved marinade, toss for 30 seconds and serve with the cucumber and lettuce.