Honey Mustard Salad Dressing

1 cup mayonnaise
1 1/2 tbsp white vinegar
1 1/2 tsp salt
2 tbl sugar
3/4 tsp freshly-ground white pepper
1/4 cup prepared mustard
1/4 cup honey plus
1 tbsp honey
1/4 cup salad oil
1 tbsp chopped fresh parsley
1 tbsp finely-chopped onion

Mix first seven ingredients in a mixer at medium speed for 1 to 2 minutes until well blended. Slowly add salad oil and continue mixing. Add chopped parsley and onion. Refrigerate for 24 hours before using.