If you're using a standard blender, you may want to soak your sun-dried tomatoes in warm water for 20 minutes, to soften them up. (Measure before soaking.) If you're using a high-speed blender, like the Vitamix, soaking isn't necessary!
Combine all of the ingredients in the blender container, and blend until well emulsified.
This dressing will thicken a bit when chilled, so I recommend chilling for at least 4 hours before serving. The flavor actually gets better when chilled overnight! Store in an air-tight container for up to a week.
For best results, choose a brand of organic sun-dried tomatoes that are free of sulfites and preservatives, and are not packed in oil. I'm not sure how oil-packed tomatoes may affect the flavor of this recipe.