
A classic Cantonese-style stir-fry featuring tender, velveted beef and earthy mushrooms in a glossy, savory sauce. This quick weeknight meal is finished with a touch of butter for extra richness and served over a bed of fluffy white rice.
In a medium bowl, combine the sliced flank steak with 1 tablespoon of water, 1 teaspoon of cornstarch, 1 teaspoon of vegetable oil, 2 teaspoons of oyster sauce, and the baking soda. Mix thoroughly until the liquid is absorbed by the meat. Set aside to marinate for at least 10 minutes to tenderize.
Prepare the stir-fry sauce by whisking together the beef stock, soy sauce, dark soy sauce, 2 tablespoons of oyster sauce, sesame oil, salt, sugar, and white pepper. Ensure you use a pure beef stock to maintain an authentic stir-fry flavor.
Heat a carbon steel wok or large heavy skillet over high heat until it begins to smoke. Drizzle 2 tablespoons of oil around the perimeter, then add the marinated beef.
Spread the beef out in a single layer and sear undisturbed for 30 seconds. Stir-fry for another 30 seconds until the beef is about 80% cooked, then transfer it back to the bowl.
Reduce heat to medium. Without washing the wok, add 1 tablespoon of oil. Immediately add the ginger, garlic, and the white parts of the scallions. Sauté for 15 seconds until fragrant, then toss in the mushrooms.
Pour the Shaoxing wine around the edges of the wok to deglaze, then stir-fry everything for 20 seconds to allow the alcohol to cook off.
Pour the prepared sauce into the wok and bring it to a simmer. Once simmering, return the beef and any accumulated juices to the wok along with the remaining green scallions. Toss well to combine.
Prepare a cornstarch slurry (mix 1 tablespoon cornstarch with 1 tablespoon water). Slowly drizzle about two-thirds of the slurry into the simmering sauce while stirring constantly.
Continue stirring for about 10 seconds until the sauce thickens and becomes glossy. If you prefer a thicker sauce, add the remaining slurry; if too thick, add a splash of water. Work quickly to avoid overcooking the beef.
Turn off the heat and stir in the butter until melted and the sauce is velvety. This adds a rich finish that complements the soy flavors perfectly.
Serve the beef and mushroom stir-fry immediately, poured generously over a plate of hot cooked white rice.
For the best results, slice your beef while it is partially frozen to get thin, uniform strips. If you don't have Shaoxing wine, dry sherry is a great substitute. To ensure the beef stays tender, do not overcook it in the final steps—the residual heat will finish the cooking as the sauce thickens.
