Preheat a wok, large skillet, or griddle over high heat until smoking hot. (500+℉ on an infrared thermometer.)
In a large mixing bowl, toss the green beans in several tablespoons of neutral oil and a few pinches of kosher salt. Set aside.
In a separate medium mixing bowl, add the miso glaze ingredients and mix until completely incorporated.
Add the beans to your preheated wok, heavy bottom skillet, or griddle and sear heavily for 5 to 7-minutes until they are well browned on both sides.
Add sauce, tossing and stirring continuously for an additional 2 to 3-min until the sauce begins to thicken and it starts to stick to the beans. (Take care not to cook the sauce too long as the sugar will start to burn).
Remove from the heat and garnish with sesame seeds. Serve hot.
Notes
This recipe easily doubles, but you will likely need to cook these in two batches. Be sure to clean out your pan in between batches.