Ranch Dressing with Crudités

In a small nonstick skillet, heat the olive oil. Add the onion and cook over moderate heat, stirring occasionally, until golden brown, about 10 minutes. Scrape the onion into a blender, add the rice vinegar and puree until smooth. 

Transfer the puree to a medium bowl and stir in the next 5 ingredients. Season with salt and pepper and serve with crudités.