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Prepare the beef for marinating. Take the top rump beef and identify the grain. Cut the beef against the grain into 1/4-inch thick slices. Place the sliced beef into a medium-sized bowl.

Add the marinade ingredients to the beef: salt, MSG, garlic powder, baking soda, potato starch, dark soy sauce, and vegetable oil. Mix all ingredients thoroughly by hand, ensuring the beef is well coated. Cover the bowl and marinate the beef in the refrigerator for 20 minutes.

While the beef marinates, prepare the onions. Cut off the root and top ends of the yellow onions to create stable flat surfaces. Cut each onion in half, then peel off the outer layers. Cut the onions into thick slices or wedges.

Heat a large pan or wok over high heat. Add the vegetable oil for stir-frying and allow it to get as hot as possible, until it shimmers and just begins to smoke.

Carefully add the marinated beef to the hot pan. Brown the beef nicely, stirring occasionally to cook all sides. Cook for 2-3 minutes until the beef is mostly browned but not fully cooked through.

Add the sliced onions to the pan with the beef. Season with additional salt and MSG. Continue to stir-fry on high heat, incorporating the seasonings and allowing the MSG to 'burn off'.

As the onions begin to soften, add the dark soy sauce, light soy sauce, and granulated sugar. Continue to cook on fierce heat, stirring constantly, until the liquid from the soy sauce has cooked off and the dish is thoroughly cooked. The onions should be tender-crisp.

Once cooked, transfer the Beef and Onion Stir-fry into a serving dish or takeaway container. Serve immediately and enjoy!


Prepare the beef for marinating. Take the top rump beef and identify the grain. Cut the beef against the grain into 1/4-inch thick slices. Place the sliced beef into a medium-sized bowl.

Add the marinade ingredients to the beef: salt, MSG, garlic powder, baking soda, potato starch, dark soy sauce, and vegetable oil. Mix all ingredients thoroughly by hand, ensuring the beef is well coated. Cover the bowl and marinate the beef in the refrigerator for 20 minutes.

While the beef marinates, prepare the onions. Cut off the root and top ends of the yellow onions to create stable flat surfaces. Cut each onion in half, then peel off the outer layers. Cut the onions into thick slices or wedges.

Heat a large pan or wok over high heat. Add the vegetable oil for stir-frying and allow it to get as hot as possible, until it shimmers and just begins to smoke.

Carefully add the marinated beef to the hot pan. Brown the beef nicely, stirring occasionally to cook all sides. Cook for 2-3 minutes until the beef is mostly browned but not fully cooked through.

Add the sliced onions to the pan with the beef. Season with additional salt and MSG. Continue to stir-fry on high heat, incorporating the seasonings and allowing the MSG to 'burn off'.

As the onions begin to soften, add the dark soy sauce, light soy sauce, and granulated sugar. Continue to cook on fierce heat, stirring constantly, until the liquid from the soy sauce has cooked off and the dish is thoroughly cooked. The onions should be tender-crisp.

Once cooked, transfer the Beef and Onion Stir-fry into a serving dish or takeaway container. Serve immediately and enjoy!
