In a small bowl, whisk together the vinegar, mustard, garlic, egg yolk, 1/2 teaspoon salt, and 1/8 teaspoon pepper. While whisking, slowly add the olive oil until the vinaigrette is emulsified.
Place the greens in a serving bowl and toss them with enough dressing to moisten. Serve immediately.
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Consumption of raw or undercooked eggs, shellfish and meat may increase the risk of foodborne illness.