In a medium saucepan, bring the water and sugar to the boil.
Cook green beans for 10 minutes or until tender but crisp. Drain.
Transfer green beans to a medium bowl, and mix with garlic, onion, and mint.
In a small container with a lid, mix olive oil, cider vinegar, garlic, basil, mustard, salt, and pepper. Shake until well blended then toss into the green bean mixture.
