Sweet onion dressing has a mild, sweet onion flavor that goes perfectly with a fresh salad!

Sweet Onion Dressing.

  • Author: Bet Denton
  • Prep Time: 10 minutes
  • Total Time: 10 minutes
  • Yield: 2 cups of dressing


  • 3/4 cup canola oil (or other neutral oil such as avocado oil)
  • 3/4 cup sugar
  • 1/4 cup chopped onion
  • 1/4 cup white vinegar
  • 1/4 cup water
  • 1 heaping Tablespoon mayonnaise
  • 1 Tablespoon yellow mustard
  • 1 teaspoon celery seed
  • 1/4 teaspoon salt


  1. Add all ingredients to a powerful blender, such as a Ninja or Vitamix. Mix on high speed for 30 seconds, making sure that the sugar gets completely dissolved and the onions pieces are smoothly blended. Transfer the dressing to a jar (or wash and reuse an old dressing bottle for easy pouring!), and shake or stir before using.


The finished dressing fits perfectly in a pint Mason jar! It keeps for weeks in the fridge.