Start by trimming the ends of the green beans and washing them thoroughly. Boil them in salted water for about 3–5 minutes until tender-crisp. Immediately transfer them to cold water to stop cooking and preserve their bright green color.
In a small bowl, whisk together olive oil, white wine vinegar, Dijon mustard, honey, salt, and pepper. Mix until the dressing becomes smooth and slightly thick. This step ensures all flavors blend beautifully together.
Place the cooled green beans in a large bowl and add sliced red onion. Pour the dressing over the beans and toss gently to coat evenly. Make sure every piece is lightly dressed for the best flavor.
Sprinkle the chopped mint over the salad just before serving. Toss lightly again so the mint distributes evenly. This step adds a refreshing aroma and signature Corsican touch.
Transfer the salad to a serving dish and enjoy immediately for maximum freshness. You can also let it sit for a short time to allow the flavors to blend. Avoid keeping it too long to maintain the crisp texture.