Whisk the mustard, vinegar, 1/2 teaspoon salt, and pepper to taste in a small bowl. Gradually whisk in the oil, starting with a few drops and then adding the rest in a steady stream, to make a smooth, slightly thick dressing.
Toss the salad greens with the fennel in a large bowl. Add the smoked turkey along with the goat cheese, and walnuts to the salad. Season with salt and pepper and toss with the dressing. Divide the salad among 2 plates and serve.
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