Add the sesame oil to a cast iron wok and heat on medium-high heat. Add the garlic and cook it until it becomes golden. Add the meat to the pan and sear it until it’s browned on all sides. Next, add the green beans. Stir and fry them for 5-8 minutes or until they become flaccid. In a separate bowl, mix the soy sauce, rice vinegar, sugar and water. After you’ve mixed the liquids thoroughly add them to the pan with the meat and green beans. Cook the mixture for an additional two to three minutes or until most of the liquid is cooked off. Sprinkle the mixture with sesame seeds and serve as a single plate meal.