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In a medium bowl, combine the thinly sliced flank steak with 2 tablespoons of soy sauce, 1 tablespoon of cornstarch, 1 teaspoon of sesame oil, and 1/2 teaspoon of baking soda. Mix well to ensure the beef is evenly coated. Let marinate at room temperature for at least 15 minutes, or up to 30 minutes.

While the beef marinates, prepare the stir-fry sauce. In a small bowl, whisk together 1/4 cup of soy sauce, 2 tablespoons of oyster sauce, 1 tablespoon of rice vinegar, 1 teaspoon of granulated sugar, 1 tablespoon of chili garlic sauce, 1 teaspoon of cornstarch, and 1/4 cup of water until smooth. Set aside.

Heat 1 tablespoon of vegetable oil in a large wok or skillet over high heat until shimmering. Add half of the marinated beef in a single layer, ensuring not to overcrowd the pan. Cook for 1 to 2 minutes per side until nicely browned. Remove the cooked beef from the wok and set aside. Add the remaining 1 tablespoon of vegetable oil (if needed) and repeat with the remaining beef.

Add the yellow onion wedges and sliced red bell pepper to the same wok. Stir-fry for 3 to 4 minutes until the vegetables are slightly tender-crisp. Add the minced garlic and grated fresh ginger, and stir-fry for another 1 minute until fragrant.

Return all of the cooked beef to the wok with the vegetables. Give the prepared stir-fry sauce a quick whisk (as cornstarch tends to settle) and pour it over the beef and vegetables. Stir constantly for 1 to 2 minutes until the sauce thickens and evenly coats all ingredients.

Remove the wok from heat. Garnish the stir-fry with sliced green onions and a sprinkle of sesame seeds. Serve immediately with your favorite side dishes.


In a medium bowl, combine the thinly sliced flank steak with 2 tablespoons of soy sauce, 1 tablespoon of cornstarch, 1 teaspoon of sesame oil, and 1/2 teaspoon of baking soda. Mix well to ensure the beef is evenly coated. Let marinate at room temperature for at least 15 minutes, or up to 30 minutes.

While the beef marinates, prepare the stir-fry sauce. In a small bowl, whisk together 1/4 cup of soy sauce, 2 tablespoons of oyster sauce, 1 tablespoon of rice vinegar, 1 teaspoon of granulated sugar, 1 tablespoon of chili garlic sauce, 1 teaspoon of cornstarch, and 1/4 cup of water until smooth. Set aside.

Heat 1 tablespoon of vegetable oil in a large wok or skillet over high heat until shimmering. Add half of the marinated beef in a single layer, ensuring not to overcrowd the pan. Cook for 1 to 2 minutes per side until nicely browned. Remove the cooked beef from the wok and set aside. Add the remaining 1 tablespoon of vegetable oil (if needed) and repeat with the remaining beef.

Add the yellow onion wedges and sliced red bell pepper to the same wok. Stir-fry for 3 to 4 minutes until the vegetables are slightly tender-crisp. Add the minced garlic and grated fresh ginger, and stir-fry for another 1 minute until fragrant.

Return all of the cooked beef to the wok with the vegetables. Give the prepared stir-fry sauce a quick whisk (as cornstarch tends to settle) and pour it over the beef and vegetables. Stir constantly for 1 to 2 minutes until the sauce thickens and evenly coats all ingredients.

Remove the wok from heat. Garnish the stir-fry with sliced green onions and a sprinkle of sesame seeds. Serve immediately with your favorite side dishes.
