Remove from the pan using tongs and keep warm. Add the remaining oil to the pan and stir-fry the beef over a high heat until cooked through, 2–3 minutes. Add the vegetables, mushrooms, garlic and ...
Allow the beef to cook undisturbed for a couple of minutes to develop a nice brown color. Then, stir it into the onions and continue cooking. Season with salt and pepper, and if desired, add minced ...