Instructions

• Cut the flank steak against the grain into thin 1/4 inch slices.
• In a medium sized bowl add the beef, egg, salt and 1 teaspoon cornstarch and let marinate for 30 minutes to an hour.
• To make the Beijing Beef Sauce, in a small bowl whisk together the 1/2 cup water, 1/4 cup sugar, ketchup, hoisin, soy sauce, oyster sauce, sweet chili sauce, crushed red peppers and apple cider vinegar.
• After the beef has finishing marinating add 2 tablespoons cornstarch to a bowl, add the marinated beef (discard the extra marinade).
• Heat a small saucepan with the oil on medium-high (I use a small saucepan so that I can get a deep fry on this without using a lot of oil. So I fry in small batches, if you don't mind using more oil, go for a bigger pot and you can fry these up much faster).
• With the last two tablespoons of cornstarch toss the beef one last time and shake off any excess cornstarch.
• Fry the slices, in batches, until golden brown (2-3 minutes).
• Heat a large pan on high heat and use two tablespoons of the oil you just fried the beef in.
• Add the onion and bell pepper and cook for 2-3 minutes, until it just starts caramelizing on the edges.
• Add the garlic in and continue to cook a few more seconds until fragrant.
• Remove the veggies and put them with the beef on a plate.
• Add the Beijing Beef sauce to the large pan and cook on high until it thickens, about 3-5 minutes.
• Add the beef and vegetables into the sauce and toss to combine.
• Serve immediately.