Sweet and Sour Dressing

This is excellent over cole slaw.

1 1/2 cups salad dressing
3/4 cup vinegar
1 1/2 teaspoons pepper
1 1/2 cups vegetable oil
2 1/4 cups granulated sugar
1 1/2 teaspoons celery seed
1/4 cup mustard
1 or 2 chopped onions

Blend all the ingredients together and refrigerate.