2 tablespoons white-wine vinegar
2 teaspoons Dijon mustard
1/2 teaspoon honey
Coarse salt and ground pepper
1/4 cup extra-virgin olive oil
In a medium bowl, whisk together vinegar, mustard, and honey. Season with salt and pepper. Whisk in olive oil. Add green beans and celery; toss to combine. Season to taste with salt and pepper.