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Heat a wok over high heat until it begins to smoke lightly. This is crucial for achieving 'wok hei'.

Add 2 tablespoons of oil to the hot wok, swirling to coat the surface.

Add the sliced onion to the wok and immediately add the udon noodles. If using fresh udon, separate them gently before adding. If using pre-cooked, ensure they are loosened.

Stir-fry the noodles and onions vigorously for 2-3 minutes, tossing constantly to prevent sticking and to allow the noodles to char slightly, incorporating the 'wok hei' (flames from the wok).

Add the dark soy sauce and oyster sauce to the noodles and onions. Continue to stir-fry for another 1-2 minutes, ensuring the sauces evenly coat the noodles.

Push the noodles and onions to one side of the wok, creating space. Add the thinly sliced beef to the empty side of the wok. Sear the beef for 1-2 minutes until browned, then mix it with the noodles and onions. Continue stir-frying, incorporating 'wok hei'.

Add the chopped bok choy to the wok. Stir-fry for 1-2 minutes until the bok choy is tender-crisp, using the 'wok hei' technique.

Add the minced ginger, drizzle with sesame oil, sprinkle with granulated sugar, and add the MSG (if using).

Perform a final vigorous stir-fry for 1 minute, ensuring all ingredients are well combined, heated through, and coated with the sauces and seasonings. Continue to use the 'wok hei' technique.

Serve the beef udon noodles immediately into bowls and enjoy hot.


Heat a wok over high heat until it begins to smoke lightly. This is crucial for achieving 'wok hei'.

Add 2 tablespoons of oil to the hot wok, swirling to coat the surface.

Add the sliced onion to the wok and immediately add the udon noodles. If using fresh udon, separate them gently before adding. If using pre-cooked, ensure they are loosened.

Stir-fry the noodles and onions vigorously for 2-3 minutes, tossing constantly to prevent sticking and to allow the noodles to char slightly, incorporating the 'wok hei' (flames from the wok).

Add the dark soy sauce and oyster sauce to the noodles and onions. Continue to stir-fry for another 1-2 minutes, ensuring the sauces evenly coat the noodles.

Push the noodles and onions to one side of the wok, creating space. Add the thinly sliced beef to the empty side of the wok. Sear the beef for 1-2 minutes until browned, then mix it with the noodles and onions. Continue stir-frying, incorporating 'wok hei'.

Add the chopped bok choy to the wok. Stir-fry for 1-2 minutes until the bok choy is tender-crisp, using the 'wok hei' technique.

Add the minced ginger, drizzle with sesame oil, sprinkle with granulated sugar, and add the MSG (if using).

Perform a final vigorous stir-fry for 1 minute, ensuring all ingredients are well combined, heated through, and coated with the sauces and seasonings. Continue to use the 'wok hei' technique.

Serve the beef udon noodles immediately into bowls and enjoy hot.
