Heat your wok over high heat, and add the oil. Sear the beef until just browned, remove from the wok, and set aside.
Add the garlic and red pepper to the wok and stir-fry for about 20 seconds. Add the onions and stir-fry until browned and slightly caramelized.
Toss the beef back in, along with the soy sauce, dark soy sauce, oyster sauce, fish sauce, and sugar. Stir-fry for another few seconds, and then fold in the Thai basil until it’s just wilted. Serve with jasmine rice, and garnish with cilantro.