This recipe is a combination of two that I found online. It makes enough for 6-8 side salads or 1 salad bowl. You can put the leftover dressing in the refrigerator for 3-4 days.
1/2 cup vegetable oil
1/4 cup white sugar
1 Tablespoon apple cider vinegar
1 Tablespoon prepared mustard
1/4 cup finely diced onions or 1 Tablespoon onion powder
1 Tablespoon mayonnaise
1 Tablespoon orange juice
1/4 teaspoon pepper
1/4 teaspoon celery salt
Put all ingredients in a salad dressing mix bottle or in a blender. Shake or blend for 2 minutes.