Tenderize the Beef: Mix 1 tsp of baking powder with ½ cup water. Add to the beef and let it soak for 15 minutes. This step tenderizes the meat naturally.
Marinate: Drain the beef and mix with 4 tbsp soy sauce, sesame oil, Shaoxing wine, and a pinch of black pepper. Let sit for 30 minutes.
Crisp the Edges: Dredge marinated beef in ½ cup cornstarch. This gives it a golden, crispy texture once fried.
Mix the Sauce: In a bowl, combine the remaining soy sauces, black vinegar, Doubanjiang, chili oil, and oyster sauce. Stir until smooth.
Create a Slurry: Mix 2 tbsp cornstarch with ½ cup water. This helps thicken the sauce later.
Cook the Steak: In a pan over medium heat, add 4 tbsp peanut oil and fry the beef in batches until golden and crisp. Set aside.
Sauté the Sauce: In the same pan, add the sauce mixture and simmer for 2 minutes. Transfer to a bowl.
Sauté the Veggies: Heat the remaining oil and sauté garlic and ginger for 2 minutes. Add bell peppers, then onions and salt. Cook until tender.
Combine Everything: Add back the steak, sauce, and slurry. Stir and cook for another 5 minutes until the sauce thickens and everything’s well coated.
Serve: Sprinkle with black pepper and serve hot over rice, noodles, or your favorite side
Tips
Slice the beef thinly against the grain for tenderness.