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Marinate the Steak: Slice the flank steak against the grain for tenderness. In a bowl, mix together the soy sauce, black pepper, and cornstarch. Add the steak, ensuring it’s well coated, and let it marinate for about 10 minutes. This will enhance the flavor and keep the meat juicy.
Prepare the Vegetables: While the steak marinates, slice the bell peppers into thin strips and cut the onion into half-moons. Mince the garlic and set all the vegetables aside.
Cook the Steak: Heat a wok or large skillet over high heat. Add 1 tablespoon of oil and let it heat until shimmering. Cook the marinated steak in batches to avoid overcrowding, stir-frying for about 2-3 minutes until browned and just cooked through. Remove the steak from the wok and set aside.
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