A delicious and authentic soups and broths recipe for Kung Pao Beef, prepared with traditional seasonings and techniques.
Divide the flank steak evenly along the grain into two big pieces. Then slice each piece against the grain into 1/8” (3-mm) thick pieces. Transfer into a medium bowl and add the rest of the marinating ingredients. Mix well and let marinate while preparing the other ingredients.
Mix the sauce ingredients in a medium bowl.
Heat 2 tablespoons of oil over high heat in a large frying pan or a wok. Once just smoking, add the beef pieces in an even layer. Sear the bottom until browned, 1 to 2 minutes. Flip to cook the other side for another 1 minute or so, until the beef is mostly cooked through. Transfer the beef onto a large plate.
Add the remaining 1 tablespoon of oil, chilli pepper, spring onions whites, garlic, ginger, and Sichuan peppercorns. Stir and cook for 1 minute to release the fragrance.
Add the sweet peppers. Stir and cook for 1 minute.
Return the beef to the pan. Stir the sauce again to dissolve the cornflour completely, pour into the pan. Stir and cook until the sauce thickens and coats all the ingredients evenly.
Add the peanuts and spring onions greens. Toss to combine. Transfer everything to a large plate. Serve hot as a main dish.