Emeril's Warm-Weather Potato Salad

1 small (5-ounce) white onion, halved

3 tablespoons white balsamic vinegar

1 tablespoon cider vinegar

1/2 teaspoon Dijon mustard

1/4 teaspoon honey

1/4 cup olive oil

1 tablespoon minced shallots

1 tablespoon chopped fresh chervil

2 teaspoons chopped fresh chives

1 teaspoon chopped fresh parsley

1 teaspoon chopped fresh cilantro

1 teaspoon salt

1/2 teaspoon freshly ground white pepper