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Classic French Onion Soup: 4 Easy Secrets to Perfection

Classic French Onion Soup

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A rich and flavorful soup made with caramelized onions, beef broth, and topped with melted cheese and toasted bread.

Ingredients

Scale
  • 4 large yellow onions, thinly sliced
  • 4 tbsp unsalted butter
  • 1 tbsp olive oil
  • 1 tsp sugar
  • 1/2 tsp salt
  • 1/4 tsp black pepper
  • 4 cups beef broth
  • 1 cup dry white wine
  • 1 tbsp all-purpose flour
  • 1 bay leaf
  • 1/2 tsp dried thyme
  • 4 slices French bread, toasted
  • 1 cup shredded Gruyère cheese

Instructions

  1. Melt butter with olive oil in a large pot over medium heat.
  2. Add onions, sugar, salt, and pepper. Cook until caramelized, stirring occasionally (about 30 minutes).
  3. Sprinkle flour over onions and stir for 1 minute.
  4. Add wine and scrape the bottom of the pot to deglaze.
  5. Pour in beef broth, bay leaf, and thyme. Simmer for 20 minutes.
  6. Preheat oven broiler.
  7. Ladle soup into oven-safe bowls. Top with toasted bread and shredded cheese.
  8. Broil until cheese is bubbly and golden (about 2-3 minutes). Serve hot.

Notes

  • Use a mandoline for even onion slices.
  • Caramelizing onions slowly ensures deep flavor.
  • Substitute vegetable broth for a vegetarian version.