1/3 cup champagne vinegar |
1/3 cup walnut oil or extra-virgin olive oil |
2 tablespoons minced shallot (about 1 large) |
2 tablespoons chopped fresh flat-leaf parsley |
1 tablespoon chopped fresh thyme |
3/4 teaspoon salt |
1/2 teaspoon freshly ground pepper |
4 romaine hearts |
1/2 cup chopped walnuts, toasted |