Tender beef stir fried in a rich, savory black pepper sauce with crisp bell peppers and onions! This quick and easy black pepper beef is ready in 30 minutes! A better-than-takeout main that's family-friendly and great for meal preparation or busy weeknights.
Slice the flank steak against the grain at a 45° angle into ¼-inch strips, then transfer to a large bowl. For easier slicing, freeze the beef uncovered for 45-60 minutes until the exterior firms up, then cut with a sharp knife.
Marinate the beef with the marinade ingredients as listed above for 15 minutes, and set aside.
In a small bowl, combine the sauce ingredients as listed above and set aside.
Heat vegetable oil in a large pan over medium-high heat. Sear the beef for about 2 minutes, until cooked through with lightly browned edges. Remove and set aside.
Stir-fry the onions and bell peppers for about 30 seconds, until just crisp-tender. Do not overcook.
Add the sauce and simmer for about 1 minute, until thickened. Return the beef and toss to coat. Serve immediately.
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