Place ingredients in blender except olive oil. While blender is on low, slowly pour olive oil into blender. Turn to medium, then high and blend for about 2 minutes. Dressing will thicken as it is blended and then chilled. Refrigerate. Makes 1 ½ cups of dressing. The dressing will keep in the refrigerator for up to one week. If dressing separates, just whisk briskly to combine ingredients.