Bring a large pot of cold water to a boil over high heat and salt it generously. Add the beans, and cook, uncovered, until just tender, about 6 to 8 minutes. Drain and rinse under cold water, set aside.
Whisk the soy sauce, water, sesame oil, cornstarch, and pepper flakes in a small bowl.
Heat the vegetable oil over medium-high heat in a large nonstick skillet. Add the shallots, garlic, ginger, and sesame seeds and cook until the vegetables are golden, about 3 minutes. Stir in the green beans and soy sauce mixture, bring to a boil, and cook until the green beans glaze, about 1 minute. Sprinkle with the vinegar and serve immediately.
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