Asian long beans are available at Chinese grocery stores. Yield is 4 servings.
Whisk all the ingredients together in a large bowl.
Bring a large pot of salted water to a boil.
Add the long beans.
Blanch until crisp tender, about 1 minute.
Drain and refresh beans in a bowl of ice water.
Drain and toss in a large bowl with the vinaigrette and sprinkle with the sesame seeds.