Slice the Beef: Prepare the steak by cutting it, from the grain, into ¼ inch thick strips about two inches very long. Marinate the Beef: In a very medium bowl, whisk collectively the egg, soy sauce, and one tablespoon of cornstarch.Crispy beef strips stir-fried with onion and crimson bell peppers then tossed in a very sweet and tangy sauce. You’