01 -
Slice beef with the grain into 2-inch-wide strips, then cut each strip across the grain into 1/4-inch-thick slices. Combine with ginger, soy sauce, 1 teaspoon sherry, and cornstarch in a medium bowl, stirring until the cornstarch is dissolved. Add sesame oil and mix until beef is coated.
02 -
In a small bowl, combine oyster-flavored sauce with the remaining 1 tablespoon sherry and set aside.
03 -
Heat a 14-inch flat-bottomed wok or 12-inch stainless-steel skillet over high heat until water vaporizes on contact. Swirl in vegetable oil, add beef in a single layer, and cook undisturbed until it starts to brown, about 1 minute. Stir-fry with a metal spatula for 30 seconds to 1 minute until lightly browned but not fully cooked. Transfer to a plate.
04 -
Add bok choy and chicken broth to the pan. Cover and cook for 1 to 2 minutes until greens are bright green and liquid is nearly absorbed.
05 -
Return beef to the pan, add reserved sauce, and stir-fry for 30 seconds to 1 minute until beef is cooked through and bok choy is tender-crisp.