Classic French Onion Soup (Printer-Friendly)

Rich and comforting French classic with caramelized onions in savory broth, topped with toasted bread and melted Gruyère cheese.

# What You Need:

→ Onions

01 - 3 large yellow onions, thinly sliced
02 - 1 tablespoon unsalted butter
03 - 1 tablespoon olive oil

→ Soup Base

04 - 2 cloves garlic, minced
05 - 1 teaspoon sugar
06 - 1/2 teaspoon salt
07 - 1/4 teaspoon freshly ground black pepper
08 - 2 tablespoons all-purpose flour
09 - 1/2 cup dry white wine
10 - 5 cups beef or vegetable stock
11 - 2 sprigs fresh thyme
12 - 1 bay leaf

→ Topping

13 - 4 slices French baguette, about 1 inch thick
14 - 1 tablespoon olive oil for bread
15 - 1 cup Gruyère cheese, grated

# Steps:

01 - In a large pot or Dutch oven, heat butter and olive oil over medium heat. Add sliced onions, stirring to coat. Cook, stirring frequently, until onions are soft and deeply caramelized, about 35 to 40 minutes. Add sugar and salt halfway through to aid caramelization.
02 - Add minced garlic and cook for 1 minute until fragrant.
03 - Sprinkle in the flour and cook, stirring constantly, for 2 minutes to thicken slightly.
04 - Pour white wine into the pot, scraping the bottom with a wooden spoon to release caramelized bits and incorporate them into the liquid.
05 - Pour in the stock, add thyme sprigs and bay leaf. Bring to a simmer, then reduce heat and cook uncovered for 20 to 25 minutes. Remove thyme and bay leaf. Season with pepper and additional salt to taste.
06 - Preheat oven broiler. Arrange baguette slices on a baking sheet, brush both sides with olive oil, and toast under the broiler until golden, approximately 1 to 2 minutes per side.
07 - Ladle hot soup into oven-safe bowls. Place a toasted baguette slice on top of each bowl, then cover generously with grated Gruyère cheese.
08 - Place bowls on a baking sheet and broil for 2 to 3 minutes, or until cheese is melted, bubbly, and golden brown. Serve immediately.

# Expert Suggestions:

01 -
  • The caramelization is where the magic happens—those onions become something entirely different from what you started with, sweet and umami-rich in ways that feel almost luxurious.
  • It's actually meditative to make, which means you get a genuinely delicious soup and some unexpected calm in the process.
02 -
  • Don't skip the caramelization time no matter how hungry you are—this is where all the flavor comes from, and rushing it results in soup that tastes like warm onion water.
  • Oven-safe bowls are genuinely essential because regular bowls might crack from the broiler's heat, and there's nothing more disappointing than soup landing on your oven floor.
03 -
  • Make the soup earlier in the day and reheat it gently before assembling—the flavor actually deepens as it sits, and you'll have less to do when you want to serve.
  • If your broiler is temperamental, you can actually assemble the bowls and finish them in a 450°F oven for 3-4 minutes instead, which gives you more control.
Return