Green Beans, Corn, and Carrot Salad

1/2 teaspoon kosher salt, more as needed
2 tablespoons red wine vinegar
2 garlic cloves, finely chopped
1 tablespoon Dijon mustard
1 cup extra-virgin olive oil
1/4 cup minced fresh chives
Black pepper, as needed
1 pound haricots verts, trimmed
2 2/3 cups cooked fresh corn kernels (from about 4 corn cobs)
1/2 pound carrot, peeled and coarsely grated (2 cups)

A delightful way to use haricots verts – see recipe and directions at The New York Times.