Wild Mushroom and Beef Stir-Fry

Ingredients

• 4 servings pepper black freshly ground
• 2 medium celery stalks sliced
• 1.5 teaspoons cornstarch 
• 0.5 teaspoon t brown sugar dark packed
• 8 ounces flank steak trimmed
• 2 teaspoons ginger fresh minced peeled
• 1 medium garlic clove minced
• 4 servings kosher salt 
• 2 medium leek white green rinsed halved lengthwise sliced
• 1 pound chanterelles wild cleaned ends trimmed sliced lengthwise (such as maitake, lobster, chanterelle, porcini, or shiitake)
• 1 teaspoon rice vinegar 
• 2 tablespoons rice wine dry
• 2 tablespoons soya sauce 
• 2 tablespoons vegetable oil 

Equipment

• bowl
• frying pan
• wok
• spatula

Directions

1. Cut the flank steak with the grain into 2- to 3-inch-wide strips, then cut each strip against the grain into 1/4-inch-thick pieces.
2. Place the Shaoxing or sherry, soy sauce, cornstarch, brown sugar, and vinegar in a small bowl and stir to combine; set aside.
3. Heat a 14-inch flat-bottomed wok over high heat until a bead of water vaporizes when dropped in the pan.
4. Drizzle 1 tablespoon of the oil around the perimeter of the wok and add the reserved beef in an even layer. Cook undisturbed until the beef begins to sear, about 1 minute. Using a metal spatula, stir-fry for 30 seconds until the beef is lightly browned but not cooked through.
5. Transfer to a large plate.
6. Drizzle 1 teaspoon of the oil around the perimeter of the wok.
7. Spread half of the mushrooms around the perimeter of the wok and season lightly with salt and pepper. Sear, stirring once halfway through the cooking time, until golden brown, about 2 minutes. Continue to stir-fry until the mushrooms are tender, about 30 seconds to 1 minute more.
8. Transfer the mushrooms to the plate with the beef. Repeat with another teaspoon of the oil and the remaining mushrooms.
9. Drizzle the remaining teaspoon of oil around the perimeter of the wok and add the leeks, celery, and garlic. Stir-fry until the leeks are wilted, about 2 minutes. Return the beef, mushrooms, and any accumulated juices from the plate to the wok. Stir the reserved soy sauce–cornstarch mixture and add it to the wok. Stir-fry until the beef is just cooked, about 30 to 60 seconds.
10. Serve immediately with steamed rice.