This is a great dressing for anyone who loves onions. It's originally from the R.S.V.P. Letters to the Editor section from an April 1983 issue of Bon Apetit. The recipe was requested from the Izaak Walton Inn in Glacier National Park, Montana. This is best if made several hours before using, to allow the flavors to thoroughly blend.
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.
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