Cook the green beans according to package directions, but short the cooking time by one minute. ( So if you have fresh green beans, steam them like you usually would, just for one minute less. If you are using canned .... please don't ... but if you are, you can skip this step entirely. )
In a large saucepan or wok set over medium high heat, add the green beans and the oil. Toss to coat.
Once the beans are coated with the sesame oil, add the ginger, garlic, and soy sauce. Toss the beans with the ingredients for two minutes.
Turn off the heat, and stir the ingredients for one minute more in the pan with the heat turned off.
Serve warm, topped with sesame seeds.