Tender beef stir fried with a savory black pepper sauce with bell peppers and onion! This quick and easy black pepper beef is ready in 30 minutes! A delicious main that is better-than-takeout and family-friendly.
Slice flank steak against the grain at a 45-degree angle into ¼-inch thick pieces. Transfer to a large mixing bowl. (Tip: To thinly slice beef easily, freeze it for 45-60 minute fully exposed and when the exterior is hardened, slice with a sharp knife).
Marinate sliced flank steak 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 on medium-high heat. Fry beef until cooked and slightly browned on the edges, about 2 minutes. Remove and set aside.
Fry onions and red bell peppers until crisp and slightly tender, about 30 seconds. Do not overcook.
Add the sauce and simmer to thicken, about 1 minute. Once thickened, add cooked beef and toss everything together. Enjoy!
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