I am looking for a recipe that uses a red onion, red wine, and garlic to create a sauce to be used on a fillet mignon. I see red wine sauce but not a red onion wine sauce. This is something I read about in conjunction spinach mashed potatoes. I can find recipes for spinach mashed potatoes but coming up blank on a red onion wine sauce... Thanks in advance for any help I can get with a recipe.
James