Add all the beef marinade ingredients to a bowl, mix well and cover with plastic wrap. Transfer to the fridge and let marinade for 20 minutes.
In a small bowl, combine all the sauce ingredients together, set aside.
Add the vegetable oil to a wok or large skillet and heat over high heat. Add half the beef to the wok and cook for 2 to 3 minutes until golden brown. Remove the beef to a plate and repeat with remaining beef. Drain the oil, leaving about 2 tablespoons of oil in the wok.
Over medium-high heat, add the garlic and cook for 30 seconds until aromatic. Add the onion and peppers to the wok and cook for a minute.
Add the beef back to the wok and the prepared black pepper sauce. Toss until well combined. Drizzle some extra sesame oil over the beef and stir.
Serve immediately over rice.
Notes:
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