2teaspoonscornstarch(mixed with 1 tablespoon water)
Mix together the marinade ingredients with the beef until well-coated, and set aside for 30 minutes or overnight. Next, prepare your veggies and set aside.
In a small bowl, mix the water (or beef stock, if using), sesame oil, soy sauces, oyster sauce and sugar, and set aside.
Heat your wok on high heat and spread 2 tablespoons of oil around the perimeter to coat. Once the wok and oil start to smoke, add the beef, and use your metal wok spatula to spread the beef in one even layer. Sear for 30 seconds. Turn the beef to sear the uncooked sides for another 30 seconds. At this point, the beef should be about 80% done. Turn off the heat and transfer the beef back to the marinade bowl.
Next, with the heat back on high, add the ginger and 1 tablespoon of oil to the wok. Cook for 10 seconds, and add the garlic. After 5 seconds, add the mushrooms and stir fry for another 15 seconds, giving them a good sear. Add the Shaoxing wine.
Next, add the snap peas and the bok choy, and stir fry on the highest heat for another 20 seconds until the bok choy begins to wilt. Stir in the beef and your prepared sauce mixture. Gather everything in the center of the wok.
When everything comes back up to a simmer, and the sides of the wok begin to super-heat, Stir fry everything in a circular motion so the beef and vegetables hit the sides of the wok--this gets you that wok hay flavor!
Pour the cornstarch slurry in the center of the wok while stirring. The sauce will immediately thicken, so work fast to stir everything together for another 20 seconds to evenly coat the beef and vegetables in the sauce. There should not be any standing sauce – everything should be clinging to the beef and vegetable stir fry. This is the classic restaurant-style preparation, but you can add more stock and salt or soy sauce to taste if you like a saucier stir-fry.
Turn off the heat and transfer your beef vegetable stir-fry to a serving plate; you can also dish it out individually on a bed of rice for a great one-plate meal. Enjoy immediately. Though you probably don’t need us to tell you that.