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Slice the 500g beef (sirloin or flank steak) against the grain into thin strips.

In a bowl, combine the sliced beef with 1 tablespoon soy sauce, 1 tablespoon rice vinegar, 1 teaspoon sesame oil, 1/2 teaspoon white pepper, 1 egg white, and 2 tablespoons cornflour. Mix thoroughly until the beef is well coated. Set the marinated beef aside for 15 minutes.

Dice 1/2 green bell pepper, 1/2 red bell pepper, and 1/2 onion. Slice 1/2 carrot into thin matchsticks.

In a separate bowl, combine 1/4 cup ketchup, 1/4 cup white vinegar, 1 tablespoon soy sauce, 1 tablespoon brown sugar, 1 tablespoon cornflour, and 1/4 cup water. Whisk the mixture until it is smooth and lump-free.

Heat oil for deep frying in a wok or deep pan over medium-high heat. To test if the oil is hot enough, insert a wooden chopstick into the oil; if bubbles form around it, the oil is ready. Carefully add the marinated beef in batches to avoid overcrowding the pan. Fry the beef until it turns golden brown and becomes crispy.

Remove the fried beef from the oil and place it on a wire rack or a plate lined with paper towels to drain any excess oil.

Discard most of the frying oil from the wok, leaving approximately 1 tablespoon of oil. Add 1 tablespoon minced ginger and 1 tablespoon minced garlic to the hot oil and stir-fry until fragrant. Add the diced green bell pepper, red bell pepper, onion, and sliced carrot to the wok. Stir-fry for about 2-3 minutes until the vegetables are slightly tender-crisp.

Pour the prepared sweet and sour sauce mixture into the wok with the vegetables. Stir continuously until the sauce thickens and coats the vegetables evenly.

Add the crispy fried beef back into the wok. Toss everything together until the beef and vegetables are well coated with the sweet and sour sauce. Serve immediately, optionally garnished with sesame seeds and chopped green onions.


Slice the 500g beef (sirloin or flank steak) against the grain into thin strips.

In a bowl, combine the sliced beef with 1 tablespoon soy sauce, 1 tablespoon rice vinegar, 1 teaspoon sesame oil, 1/2 teaspoon white pepper, 1 egg white, and 2 tablespoons cornflour. Mix thoroughly until the beef is well coated. Set the marinated beef aside for 15 minutes.

Dice 1/2 green bell pepper, 1/2 red bell pepper, and 1/2 onion. Slice 1/2 carrot into thin matchsticks.

In a separate bowl, combine 1/4 cup ketchup, 1/4 cup white vinegar, 1 tablespoon soy sauce, 1 tablespoon brown sugar, 1 tablespoon cornflour, and 1/4 cup water. Whisk the mixture until it is smooth and lump-free.

Heat oil for deep frying in a wok or deep pan over medium-high heat. To test if the oil is hot enough, insert a wooden chopstick into the oil; if bubbles form around it, the oil is ready. Carefully add the marinated beef in batches to avoid overcrowding the pan. Fry the beef until it turns golden brown and becomes crispy.

Remove the fried beef from the oil and place it on a wire rack or a plate lined with paper towels to drain any excess oil.

Discard most of the frying oil from the wok, leaving approximately 1 tablespoon of oil. Add 1 tablespoon minced ginger and 1 tablespoon minced garlic to the hot oil and stir-fry until fragrant. Add the diced green bell pepper, red bell pepper, onion, and sliced carrot to the wok. Stir-fry for about 2-3 minutes until the vegetables are slightly tender-crisp.

Pour the prepared sweet and sour sauce mixture into the wok with the vegetables. Stir continuously until the sauce thickens and coats the vegetables evenly.

Add the crispy fried beef back into the wok. Toss everything together until the beef and vegetables are well coated with the sweet and sour sauce. Serve immediately, optionally garnished with sesame seeds and chopped green onions.
