1. In a medium size bowl, add beef, garlic, soy sauce, sugar and cornstarch. Stir until mixed well and let marinated for 30 minutes.
2. Heat oil in a wok over medium heat. Add marinated beef and stir fry until nearly cooked. Then add chinese kale, chili, spring onions, cooking wine and oyster sauce. Stir fry until all ingredients mixed well and the beef cooked thoroughly.
3. Transfer to a serving dish (over fried chinese kale). Serve immediately with hot steamed rice.