Quick and savory beef stir-fry with bell peppers and onions in a flavorful soy-based sauce. A simple dinner that’s big on taste and ready in 30 minutes.
1 lb flank or sirloin steak, thinly sliced
2 tbsp soy sauce (divided)
1 tsp rice vinegar
2 tsp cornstarch (divided)
1 red bell pepper, sliced
1 green bell pepper, sliced
1 large onion, sliced
2 garlic cloves, minced
1 tsp fresh ginger, minced
1 tbsp oyster sauce
1 tsp sugar
1/4 cup water
1 tbsp oil
1 tsp sesame oil
Toss beef with 1 tbsp soy sauce, vinegar, and 1 tsp cornstarch. Marinate 15 minutes.
Mix remaining soy sauce, oyster sauce, sugar, 1 tsp cornstarch, and water in a bowl.
Heat oil in a skillet or wok. Sear beef in batches until browned. Set aside.
Sauté garlic and ginger for 30 seconds.
Stir-fry bell peppers and onion for 2–3 minutes.
Return beef to pan. Add sauce and cook until thickened.
Finish with sesame oil. Serve hot over rice.