Step 1

Cut beef into 4 equal wedges. Transfer to plate and freeze until very firm, 20 to 25 minutes. While beef freezes, prepare gai lan. Remove leaves, small stems, and florets from stalks; slice leaves crosswise into 1½-inch strips (any florets and stems can go into pile with leaves); and cut stalks on bias into ¼-inch-thick pieces. Set aside. When beef is firm, stand 1 piece on its side and slice against grain ¼ inch thick. Repeat with remaining pieces. Transfer to bowl. Add 1 teaspoon Shaoxing wine, 1 teaspoon soy sauce, and 1 teaspoon cornstarch and toss until beef is evenly coated. Set aside.

Step 2

In second bowl, whisk together ½ cup broth, oyster sauce, ½ teaspoon sesame oil, remaining 4 teaspoons Shaoxing wine, remaining 2 teaspoons soy sauce, and remaining 1 teaspoon cornstarch; set aside. In third bowl, combine 4 teaspoons vegetable oil, ginger, and ¼ teaspoon garlic.

Step 3

Heat 1 teaspoon vegetable oil in wok over high heat until just smoking. Add stalks and cook, stirring slowly but constantly, until spotty brown and crisp-tender, 3 to 4 minutes. Transfer to bowl.

Step 4

Add remaining 1 teaspoon sesame oil, remaining 1 teaspoon vegetable oil, and remaining ½ teaspoon garlic to wok and cook, stirring constantly, until garlic is fragrant, about 15 seconds. Add leaves and cook, stirring frequently, until vibrant green, about 1 minute. Add remaining ¼ cup broth and cook, stirring constantly, until broth evaporates, 2 to 3 minutes. Spread evenly on serving dish.

Step 5

Add ginger-garlic mixture to wok and cook, stirring constantly, until fragrant, about 30 seconds. Add beef and cook, stirring slowly but constantly, until no longer pink, about 2 minutes. Return stalks to wok and add oyster sauce mixture. Cook, stirring constantly, until sauce thickens, 30 to 60 seconds. Place mixture on top of leaves. Serve.