This recipe appears in:Sauced: Franch Dressing (and Creamy French Dressing)
About the author: Joshua Bousel brings you new, tasty condiment each Wednesday and a recipe for weekend grilling every Friday. He also writes about grilling and barbecue on his blog The Meatwave whenever he can be pulled away from his grill.
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Place ketchup, onion, mayonnaise, vinegar, sugar, Worcestershire sauce, paprika, garlic powder, and salt in jar of a blender. Puree until onion is completely chopped.
With the motor running, slowly pour in vegetable oil. Use immediately or transfer to an airtight container and store in refrigerator for up to two weeks.