Tender beef stir-fried with aromatic onions in a savory sauce. This quick and easy beef onion stir-fry recipe uses simple ingredients - ready in just 30 minutes, making it a perfect main with rice. Family-friendly, better-than-takeout, and great for meal preparation!
Slice flank steak against the grain at a 45-degree angle into ¼-inch thick pieces. Transfer to a medium bowl. (Tip: To thinly slice the beef easily, freeze it for 45-60 minutes exposed to the cold air and slice with a sharp knife).
Marinate the beef with the marinade ingredients as listed above for 15-20 minutes.
In a small bowl, combine the sauce ingredients as listed above and set aside.
Heat vegetable oil in a large pan on low heat. Sauté the white onions and scallion whites for 30 seconds. Remove and set aside.
Increase to medium-high heat and fry marinated beef in a single layer and brown on both sides, about 2-3 minutes per side.
Reduce to medium heat. Add the sauce in a circular motion and stir-fry until sauce thickens, about 30-60 seconds. Add garlic, scallion greens, and the cooked onions from before. Toss everything together for another 30-60 seconds. Remove from heat and enjoy!
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