Combine first 5 ingredients; set aside.
Soak potato in cold water 5 minutes. Drain and pat dry.
Heat oil in a large nonstick skillet over medium-high heat. Add onions, ginger, garlic, and chiles; stir-fry 30 seconds. Add potato; stir-fry 4 minutes or until crisp-tender. Add vinegar mixture, and stir-fry 1 minute. Serve immediately.