Easy Beef Onion Stir Fry – A Quick Weeknight Favorite
A savory and satisfying stir-fry made with thinly sliced beef, caramelized onions, and a soy-based sauce. Quick, flavorful, and perfect for busy nights.
- Prep Time: 15 minutes
- Cook Time: 10 minutes
- Total Time: 25 minutes
- Yield: 4 servings 1x
Ingredients
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1 lb flank or sirloin steak, thinly sliced across the grain
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2 tablespoons soy sauce (plus extra for sauce)
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1 tablespoon cornstarch
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1 tablespoon sesame oil
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1 large yellow onion, sliced
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2 cloves garlic, minced
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1 tablespoon oyster sauce
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1/4 cup water or beef broth
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2 tablespoons vegetable oil
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Optional: green onions, bell peppers, chili flakes
Instructions
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In a bowl, combine sliced beef with soy sauce, cornstarch, and sesame oil. Let marinate for 10–15 minutes.
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Heat 1 tablespoon oil in a wok or skillet over high heat. Stir-fry beef in batches for 1–2 minutes per side. Remove and set aside.
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Add remaining oil to the pan. Stir-fry onions for 2–3 minutes until soft and lightly golden. Add garlic and cook for 30 seconds.
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Return beef to the pan. Add oyster sauce, 1 tablespoon soy sauce, and 1/4 cup water or broth. Stir to coat.
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Cook for 1–2 minutes until sauce thickens slightly. Drizzle with extra sesame oil if desired.
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Serve hot with rice or noodles.
Notes
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Add vegetables like bell peppers or mushrooms for variety.
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For gluten-free, use tamari instead of soy sauce.
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Store leftovers in the fridge for up to 3 days.