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French onion soup in a bowl with cheese croutons on top.

French Onion Soup

Prep Time: 20 minutes
Cook Time: 1 hour 20 minutes
Total Time: 1 hour 40 minutes
Servings: 8
Author: Amy Duska

Ingredients

  • 3 lbs. onions
  • 2 tablespoons butter
  • 2 tablespoons olive oil
  • 2 teaspoons sea salt
  • 1 tablespoon sugar
  • 1 cup dry white wine
  • 8 cups beef broth
  • 1 teaspoon ground black pepper
  • 2 dried bay leaves
  • 2 teaspoons fresh thyme leaves
  • 1 loaf sourdough bread or french baguette
  • 8 slices swiss cheese or grated Swiss cheese

Instructions

  • Prep the onions. Peel the onions, cut them in half and then into ¼" slices.
  • Soften the onions. In a large pot, melt 2 tablespoons of butter and 2 tablespoon of olive oil together over medium heat. Add the onions and cook until they are soft, about 20 minutes.
  • Caramelize the onions. Turn the heat up to medium-high. Add 2 teaspoons of salt and stir frequently for 15 minutes. Add 1 tablespoon of sugar and continue to cook until the onions are caramelized, about 15 more minutes.
  • Deglaze the pot. Add 1 cup of white wine to the pot and use a spatula to scrape and deglaze the brown bits from the bottom of the pot.
  • Simmer. Add 8 cups of beef broth along with the 1 teaspoon black pepper, 2 bay leaves and 2 teaspoons thyme leaves. Bring the soup to a boil, turn down the heat and let it simmer for 30 minutes.
  • Prepare the toppings. Turn the oven broiler on HIGH. Cut the bread into slices and arrange them onto a baking sheet. Brown them under the oven broiler for 1-2 minutes. Remove the tray from the oven. Turn each bread slice over and place a slice of Swiss cheese on top. Return the baking sheet under the broiler to melt the cheese on top, 1-2 minutes.
  • Assemble. Ladle the soup into a bowl and place a toasted slice on top before serving.
Nutrition Facts
French Onion Soup
Amount Per Serving
Calories 390 Calories from Fat 99
% Daily Value*
Fat 11g17%
Saturated Fat 4g25%
Trans Fat 1g
Polyunsaturated Fat 1g
Monounsaturated Fat 4g
Cholesterol 15mg5%
Sodium 1852mg81%
Potassium 495mg14%
Carbohydrates 55g18%
Fiber 5g21%
Sugar 11g12%
Protein 15g30%
Vitamin A 188IU4%
Vitamin C 14mg17%
Calcium 156mg16%
Iron 3mg17%
* Percent Daily Values are based on a 2000 calorie diet.

Notes

Store the soup, without the croutons, in the fridge for up to 5 days or in the freezer for up to 3 months.