1 can tomato soup
3/4 c. vinegar
1/2 c. sugar - for low-cal use 6 pkgs. Equal
1 c. oil
1 sm. onion, diced
1/2 tsp. paprika
1/2 tsp. dry mustard
1 tsp. salt

Mix all ingredients together in a kettle. Bring to a boil, stirring constantly. Cool and put into a bottle and refrigerate. Very good.