For the dressing, combine all ingredients in a blender or food processor. Puree until very smooth scraping sides as needed; about 1 minute.
Serve immediately, or cover and store refrigerated for up to 1 week.
To assemble wedge salads, drizzle each lettuce wedge with 2 to 3 tablespoons of dressing. Top with diced tomatoes, chopped egg, bacon bits, green onion and crumbled blue cheese. Serve immediately.
Serving suggestions: For chunky dressing, reserve half of the blue cheese, crumble and stir in after the dressing has been pureed. Try stirring in a few drops of hot sauce for extra zip.