I found this recipe. I haven't tried it so I don't know if it would be good. I think they make a no-sugar added or SBD friendly ketchup. Maybe you could substitute splenda or your favorite sweetener for the sugar.
Quote:
http://www.recipezaar.com/33561
1960's Catalina Dressing Recipe #33561
A very popular salad dressing on a comeback trail..!
1/2 cup ketchup
1/2 cup sugar
1/2 cup red wine vinegar
1/2 cup onions, grated
1 teaspoon paprika
1/2 teaspoon Worcestershire sauce
1 cup salad oil
salt and pepper