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Spoon holding cheese from French Onion soup; - Girl and the Kitchen

Onion Soup with classic French recipe

  • Author: Mila
  • Total Time: 1 hour 10 minutes
  • Yield: 4 1x


  • 6 tablespoons (90g) unsalted butter, plus more for toasts
  • 3 pounds (1.4kg) yellow or mixed onions, sliced 1/8 inch thick
  • Kosher salt and freshly ground black pepper
  • 1/2 cup Cognac or brandy
  • 2 quarts chicken stock
  • 34 sprigs thyme
  • 1 teaspoon cider vinegar (totally optional) but I love the slight bite it gives it


  1. Add olive oil and butter to a pan that is set to low medium heat.
  2. Add the onions into the pan and allow them to start sweating.  Season with salt and pepper.
  3. Let this sweat out for 20 minutes!  Do not touch! 
  4. Let’s multitask and go ahead and make those crostini.
  5. Taste the onions for seasoning.  Adjust as necessary. Let them cook over low to medium heat for about 30 more minutes.  
  6. Let’s flambe! Add in your cognac (or other choice of liquor) FROM A GLASS not from the bottle! With a long stick lighter go ahead and light the mixture on fire and allow the alcohol to start cooking off.  
  7. Add in your stock or bone broth. Taste and adjust seasoning.
  8. Allow to come to a boil then simmer for 5-10 minutes.
  9. Place crostini into your soup crocks and cover completely with soup. Cover with cheese
  10. Place under the broiler until melty!  OR you can use a blow torch to really get cheesy! 
  • Prep Time: 10 minutes
  • Cook Time: 60 minutes

Keywords: French Onion soup, French recipes, soup recipes, comfort recipes