Ingredients
1 lb flank steak, thinly sliced against the grain
2 tablespoons soy sauce
1 tablespoon oyster sauce
1 tablespoon cornstarch
1 teaspoon sugar
1 teaspoon sesame oil
1 tablespoon vegetable oil
1 tablespoon minced garlic
1 teaspoon fresh ginger, minced
1 large onion, sliced
1 green bell pepper, sliced
1 red bell pepper, sliced
1 teaspoon freshly ground black pepper, or to taste
1/4 cup beef broth or water
Salt to taste
Optional sliced green onions for serving
Method
Step 1
Place the sliced flank steak in a bowl. Add soy sauce, oyster sauce, cornstarch, sugar, and sesame oil. Mix well until the beef is evenly coated. Let marinate for 20 to 30 minutes.
Step 2
Heat a large skillet or wok over high heat. Add the vegetable oil and swirl to coat the pan.
Step 3
Add the marinated beef in a single layer. Sear quickly for 1 to 2 minutes per side until just browned. Remove the beef from the pan and set aside.
Step 4
In the same pan, add garlic and ginger. Stir-fry for about 20 seconds until fragrant.
Step 5
Add the sliced onions and bell peppers. Stir-fry for 2 to 3 minutes until slightly softened but still crisp.
Step 6
Return the beef to the pan. Sprinkle in the black pepper and add the beef broth. Stir everything together and cook for another 1 to 2 minutes until the sauce thickens and coats the steak and vegetables.
Step 7
Taste and adjust seasoning with salt if needed. Remove from heat.
Serving Suggestions
Serve hot over steamed white rice, fried rice, or noodles. This dish is best enjoyed immediately while sizzling and tender.