1. Cook green beans in boiling water for 4- 5 minutes until tender, but still crisp.
2. Drain, immerse in ice water till cool. Drain.
3. Whisk vinegars, sugar, olive oil, salt and pepper together in a serving bowl. Add onion and green beans, stir together.
4. Marinate in refrigerator for at least five hours. Shake it up once in awhile. Over night is even better.
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