In a small bowl, whisk together 2 tablespoons white-wine vinegar, 3 tablespoons extra-virgin olive oil, and 1/2 teaspoon Dijon mustard; season with coarse salt and ground pepper. In a large bowl, toss dressing with 2 heads Boston lettuce (1 1/2 pounds total), torn into bite-size pieces, and 2 cups mache or fresh parsley leaves. Serve immediately.
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