Panda Express menus have plenty of stir-fry options, but the Black Pepper Sirloin Steak is the one regulars order again and again. This copycat recipe marinates cubed Angus sirloin in soy sauce, cornstarch, and baking soda for that classic takeout texture, then stir-fries it with broccoli, mushrooms, onion, and bell pepper in a bold black pepper sauce.
A quick sear...