Tender beef, crisp bell peppers, and onions stir-fried in a rich, savory black pepper sauce. This easy black pepper beef recipe is ready in just 30 minutes. I velvet the beef with baking soda and cornstarch to keep it tender and juicy during stir-frying.
Optional: Freeze the beef uncovered for 45-60 minutes until slightly firm for easier thin slicing.
Using a sharp knife, slice the flank steak against the grain at a 45° angle into ¼-inch-thick strips.
Transfer the beef strips to a large bowl. Add the beef marinade ingredients and mix well. Set aside to marinate for 15-20 minutes.
In a small bowl, combine the sauce ingredients and whisk until well mixed. Set aside.
Heat the vegetable oil in a large pan or wok over medium-high heat. Once hot, add the beef in a single layer, cooking in batches if needed. Sear on both sides for about 2-3 minutes total, until cooked through with lightly browned edges. Remove and set aside.
In the same pan over medium-high heat, stir-fry the onions and bell peppers for about 30 seconds until crisp-tender.
Re-whisk the sauce and pour it into the pan. Simmer for about 1 minute until glossy and thick enough to coat the back of a spoon. Return the beef and toss briefly until evenly coated and heated through. Serve immediately.
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