Combine the ground meat with all the marinade ingredients. Stir until any standing liquid has been absorbed by the meat. Marinate for 15-20 minutes.
Heat 2 tablespoons of oil in a wok over medium heat. Add the chopped green beans. Stir and spread the beans into a single layer. Cook for 30 seconds. Then stir and repeat the spreading step several times until the green beans are slightly charred, wilted, and cooked through. Turn the heat lower if needed to avoid burning. It takes about 5-8 minutes to cook the green beans this way. (To speed up the cooking, add a few drops of water each you stir, to create some steam.) Transfer the cooked green beans to a dish and set aside.
Now add 1 tablespoon oil to the wok, with the heat turned up to high. Add the ground meat and brown it. Don’t stir too much; give the meat a chance to brown and crisp. Once the meat has browned, reduce the heat to medium.
Next, add the garlic, bell pepper and chilies. Stir-fry for 1 minute. Add in the cooked green beans, ¼ teaspoon sugar, 1 teaspoon sesame oil, 1 tablespoon light soy sauce, ¼ teaspoon ground white pepper, a pinch of salt (to taste), and 2 tablespoons water. With the heat all the way up on high, stir-fry for a final 10-15 seconds and serve.