Simple Lemon Vinaigrette

Maked about 1/3 cup

Time: 10 minutes

Ingredients:
1/2 teaspoon finely grated lemon zest
2 tablespoons freshly squeezed lemon juice
1 teaspoon sugar
1/2 teaspoon Dijon mustard
1/4 teaspoon fine sea salt, or to taste
3 to 4 tablespoons extra-virgin olive oil
Freshly ground black pepper to taste

Preparation

In a small bowl, whisk together the lemon zest, lemon juice, sugar, mustard, and fine sea salt, whisking until the sugar and salt are dissolved. Add 3 tablespoons of the oil in a slow stream, whisking constantly until the dressing is well blended. Season with fine sea salt and freshly ground black pepper. If desired, whisk in the remaining oil in a slow stream, whisking constantly. 

DO AHEAD: The vinaigrette can be prepared ahead and refrigerated, in an airtight container, up to 3 days.

Source: http://www.epicurious.com/