How to Make It
Trim the ends of the bok choy. Wash, pat dry with paper towels, and then set aside.
Heat a large skillet or wok over medium-high heat. Add the oil, and then add the garlic and ginger. Cook for 1-2 minutes, or until soft, and then lay the beef slices flat on the pan. Cook each side for 1 minute or until browned.
Stir in the bok choy and cook for 1 minute, or until the bok choy just starts to wilt.
Stir in the oyster sauce, fish sauce and bell pepper and cook for about 1 minute or until heated through.
Garnish with sesame seeds and serve warm.