Ingredients

• 12 ounces beef flank steak, trimmed
• 1 tablespoon minced fresh ginger
• 1 ½ teaspoons reduced-sodium soy sauce
• 1 teaspoon dry sherry plus 1 tbsp., divided
• 1 teaspoon cornstarch
• 1 teaspoon toasted sesame oil
• 2 tablespoons oyster-flavored sauce, preferably lee kum kee premium
• 1 tablespoon vegetable oil
• 1 pound baby bok choy, trimmed and cut into 2-inch pieces (about 8 cups)
• 3 tablespoons unsalted chicken broth