Directions
In small bowl, whisk together vinegar, shallots and mustard. Slowly add oil in a steady stream, whisking constantly until mixture is emulsified. Season with salt and peper to taste. Toss Vinaigrette with mixed greens, using about 5 tablespoons for 8 cups of greens. Cover and refrigerate remaining Vinaigrette in nonreactive container up to 2 weeks.