Onion Salad Dressing 4   Ingredients: 1 cup of salad oil. 1/2 cup of white vinegar. 3/4 cup of sugar. 1 teaspoon of salt. 1 teaspoon of dry mustard. 1 teaspoon of celery seed. 1 medium onion, grated. Directions: Mix salad oil, sugar, salt, mustard, and onion with beater. Beat and add vinegar. Slowly beat until thickened. Serve over coleslaw. Download This Recipe