Honey Mustard Dressing

1/4 cup vinegar
1 cup of mayonnaise
1 teaspoon of mustard
1 tablespoon of sugar
1/4 cup onion, chopped
1/2 cup honey
1 teaspoon of parsley flakes
Salt and pepper, to taste
1/2 cup vegetable oil

Combine all ingredients, except oil in blender. Process the mixture until smooth. While blender is running, slowly add oil until well blended. Store dressing in refrigerator.