Whisk all ingredients in a small bowl until emulsified.
Adjust salt and pepper as necessary.
Drizzle over butter lettuce or salad of choice.
Sprinkle with freshly grated lemon zest, toss gently and serve.
Fresh lemon zest really compliments this vinaigrette. Whether you use a citrus zester or a microplane, the trick to zesting is to only remove the thin, colored skin that is full of flavor. Avoid the soft, white pith underneath, which can be bitter and unpleasant to taste.