Stir-fry the beans
Heat a wok or large frying pan over high heat until hot and add the oil. Add the pork and stir-fry until no longer pink, about 2 minutes. Add the ginger, garlic, green onion, and chile and stir-fry for about 10 seconds until fragrant. Stir in the green beans. Give the sauce a quick stir, then add to the pan and stir-fry until the beans are heated through and the sauce thickens, about 1 minute. Serve with the steamed rice, if using.