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Tender beef stir-fried with colorful bell peppers and sweet onion in a savory sauce for a quick and flavorful weeknight dinner.
Stir-Fry
1 lb flank steak, thinly sliced against the grain
1 red bell pepper, thinly sliced
1 green bell pepper, thinly sliced
1 yellow bell pepper, thinly sliced
1 medium onion, thinly sliced
2 tbsp vegetable oil
Sauce
¼ cup soy sauce
2 tbsp oyster sauce
1 tbsp cornstarch
2 tbsp water
1 tbsp rice vinegar
1 tbsp honey or brown sugar
2 cloves garlic, minced
1 tsp grated fresh ginger
1 tsp sesame oil
Optional: ½ tsp red pepper flakes
Prepare the sauce
In a small bowl, whisk together soy sauce, oyster sauce, cornstarch, water, rice vinegar, honey, garlic, ginger, sesame oil, and red pepper flakes (if using). Set aside.
Cook the steak
Heat 1 tablespoon of oil in a large skillet or wok over medium-high heat. Add the beef and stir-fry for 2–3 minutes, until browned and just cooked through. Remove from the pan and set aside.
Stir-fry vegetables
Add the remaining oil to the skillet. Stir-fry bell peppers and onion for 4–5 minutes, until tender-crisp.
Combine and thicken
Return the steak to the skillet and pour in the sauce. Stir well and cook for 2–3 minutes, until the sauce thickens and coats everything evenly.
Serve
Remove from heat and serve hot over steamed rice or noodles. Garnish with sesame seeds or green onions if desired.
Slice steak against the grain to ensure tenderness.
Use high heat for the best stir-fry texture and flavor.
Oyster sauce can be substituted with hoisin sauce or extra soy sauce if needed.
Fresh bell peppers provide the best texture, but frozen can be used in a pinch.