Onion Salad Dressing - cooking recipe

Ingredients

1/2 cup finely chopped onion
1/4 cup cider vinegar
1/4 cup sugar
1/2 teaspoon salt
1/2 teaspoon dry mustard
1/4 teaspoon celery seed
1/2 cup canola oil

Preparation

Combine all ingredients except oil in blender and mix well, stopping as necessary to scrape down sides of container.
With machine running, gradually pour in oil, blending until dressing is creamy.
Transfer to container with tight-fitting lid and refrigerate before using, allowing flavors to blend.
Whisk or shake if dressing separates upon standing.