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Authentic Parisian Bistro French Onion Soup

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This classic French onion soup is a warm embrace for the soul, featuring caramelized onions in a rich broth topped with melted cheese. Perfect for a cozy dinner, it brings the charm of Parisian bistros right to your table.

Ingredients

Scale
  • 6 large yellow onions (about 1.1 kg), thinly sliced
  • 4 tablespoons unsalted butter
  • 2 tablespoons olive oil
  • 1 teaspoon salt
  • 1 teaspoon sugar (to help caramelize the onions)
  • 4 cloves garlic, minced
  • 1 cup dry white wine (such as Sauvignon Blanc)
  • 8 cups beef broth (preferably homemade or low sodium)
  • 1 tablespoon fresh thyme leaves (or 1 teaspoon dried thyme)
  • 2 bay leaves
  • Freshly ground black pepper, to taste
  • 1 French baguette, sliced into 2.5 cm thick rounds
  • 2 cups grated Gruyère cheese (or a mix of Gruyère and Emmental)
  • 1 cup grated Parmesan cheese
  • Fresh parsley, chopped (for garnish)

Instructions

  1. Prepare the onions: In a large pot, melt the butter and olive oil over medium heat. Add the sliced onions and salt. Stir well to coat them. Cook for about 5 minutes until they begin to soften.
  2. Caramelize the onions: Reduce the heat to medium-low and add the sugar. Continue cooking, stirring regularly for about 30 to 40 minutes, until the onions are a deep golden brown. Watch carefully to prevent burning.
  3. Add the garlic: Stir in the minced garlic and cook for 1 to 2 minutes until fragrant. This will add a nice depth of flavor to your soup.
  4. Deglaze with wine: Pour the white wine into the pot and scrape the bottom to release the browned bits. Let it simmer for about 5 minutes for the alcohol to evaporate and the mixture to reduce slightly.
  5. Incorporate the broth: Add the beef broth, thyme, bay leaves, and pepper. Bring to a boil, then reduce the heat and let simmer for 20 to 30 minutes. This simmering time allows the flavors to meld.
  6. Prepare the bread: While the soup simmers, preheat your oven to 180°C (350°F). Arrange the baguette slices on a baking sheet and toast them in the oven for about 10 minutes until golden and crispy.
  7. Assemble the soup: Remove the bay leaves from the soup. Fill oven-safe bowls with the hot soup, add one or two slices of toasted bread on top, then generously cover with the grated cheese.
  8. Gratinate: Place the bowls on a baking sheet and bake for 10 to 15 minutes until the cheese is melted and golden. Watch closely to avoid burning the cheese.
  9. Serve: Remove from the oven, let sit for a few minutes, and garnish with chopped fresh parsley before serving. Enjoy your delicious Parisian bistro-style French onion soup!

Nutrition

Keywords: Take your time with the caramelization step for unmatched flavor depth. A good quality pot is ideal for even cooking. Feel free to experiment with herbs or add a bit of spice for a unique twist.

Find it online: https://engosify.com/soupe-a-loignon-gratinee-recette-bistrot-parisien-authentique/