Cook beans in large pot boiling water until tender, about 6 minutes; drain.
Stir-fry beef, ginger and garlic in hot oil in skillet 3 to 5 minutes.
Whisk broth, peanut butter, vinegar, soy and sesame oil in small bowl. Add to beef; cook until mixture boils and thickens slightly. Add beans; heat. Transfer to platter; sprinkle with peanuts. Serve.