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French Onion Soup

  • Author: Katelyn
  • Total Time: 1 hour 45 minutes
  • Yield: 6 servings 1x


The most flavorful French onion soup filled with rich, deep caramelized onions and simmered with fresh herbs. Top with lots of bubbly cheese on a crusty baguette for the coziest Winter soup.


  • 3 tablespoons grapeseed oil
  • 3 tablespoons unsalted butter
  • 7 large yellow onions, halved and sliced about 1/4 inch thick 
  • 1 teaspoon kosher salt
  • 1 teaspoon packed brown sugar
  • 2 teaspoons minced garlic
  • 3 tablespoons of all purpose flour
  • 1/3 cup dry sherry
  • 1 teaspoon balsamic vinegar
  • 8 cups beef stock
  • 2 springs fresh thyme
  • 1 bay leaf


  • Crusty Baguette
  • Shredded Gruyere cheese or mozzarella


  1. Add grapeseed oil and butter to a large Dutch oven or heavy bottom pot and heat over medium high until butter is melted. 
  2. Add the sliced onions, kosher salt, and brown sugar and stir to coat. 
    stainless steel bowl filled with sliced yellow onions
  3. Reduce heat to medium and stir about every 5 minutes until all the moisture evaporates from the onions.
  4. At this point, you will need to stir more frequently to prevent uneven caramelization or burning.
  5. Continue to stir and cook the onions for 45 minutes to an hour until you have achieved a nice dark brown caramelization. 
  6. Stir in the minced garlic and cook until aromatic, about 30 seconds.
  7. Deglaze pan with sherry and balsamic vinegar being sure to scrape up any brown bits from the bottom of the pot.
  8. Stir in flour and cook for about a minute, stirring continuously
  9. Add beef broth, fresh thyme, and bay leaf, and simmer for 20 minutes.
    dutch oven filled with caramelized onions and wooden spoon. Hand holding fresh thyme above.

Topping (see notes section if you don’t have cocottes)

  1. Ladle the soup into oven proof ramekins or cocottes, top each cocotte with a slice of crusty bread and shredded cheese.
  2. Place cocottes on baking sheet and place under the broiler until the cheese becomes golden and bubbly.


  • Getting truly caramelized onions is a process. It normally takes a full hour to achieve rich, dark brown caramelized onions.
  • If you don’t have oven proof cocottes or ramekins, just broil the cheese bread on a sheet pan by itself and add a slice to the top of a bowl of soup. 
  • Prep Time: 15 minutes
  • Cook Time: 1 hour 30 minutes
  • Category: Soups
  • Method: Simmered
  • Cuisine: French

Keywords: onion, soup

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