In a small bowl, whisk together the vinegar, mustard, garlic, egg yolk, salt and pepper. While whisking, slowly add the olive oil until the vinaigrette is emulsified.
Toss the greens with enough dressing to moisten and serve immediately.
Photograph by Johnny Miller
If you're worried about raw egg, just omit it.
Consumption of raw or undercooked eggs, shellfish and meat may increase the risk of foodborne illness.
Recipe from Barefoot Contessa Family Style. Copyright (c) 2002 by Ina Garten. By arrangement with Clarkson Potter/Publishers, A Division of Random House, LLC.