This is literally one of the easiest side dishes you can ever prepare. In fact, there's not even a recipe, more of a method to prep.
16 oz. steam-in-the-bag of green beans, cooked according to package directions
salt and freshly ground black pepper
Empty cooked green beans into a serving bowl. Drizzle with sesame oil. Lightly salt and pepper.
Sprinkle with sesame seeds and serve.
See? Easy peasy.